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AP Government and Politics Quiz

AP Government and Politics Quiz: Relationship Between States And National Government

Practice Relationship Between States And National Government in AP Government and Politics with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

Question 1 / 20

0 of 20 answered

A federal law conflicts with a state statute; federal officials assert federal law controls. Which clause supports them?

Select an answer to continue

What this quiz covers

This quiz focuses on Relationship Between States And National Government, giving you a quick way to practice the rules, question types, and explanations that matter most for AP Government and Politics.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

A federal law conflicts with a state statute; federal officials assert federal law controls. Which clause supports them?

  1. Supremacy Clause; valid federal law is the supreme law of the land, so conflicting state statutes must yield in court. (correct answer)
  2. Establishment Clause; federal policy overrides states whenever religion is implicated, even in purely economic or criminal state statutes.
  3. Privileges or Immunities Clause; federal statutes automatically nullify state laws whenever citizens travel across state lines for work.
  4. Republican Guarantee Clause; Congress can void any state law it dislikes because it must guarantee a republican form of government.
  5. Tenth Amendment; reserved powers mean state law always prevails over federal statutes unless a state consents to federal enforcement.

Explanation: This question examines the skill of recognizing constitutional mechanisms resolving state-federal conflicts in their relationship, emphasizing national supremacy. In federalism, when laws clash, the Constitution prioritizes valid federal statutes to maintain a unified system. The correct answer, A, invokes the Supremacy Clause from Article VI, which declares federal law the supreme law of the land, requiring state laws to yield in direct conflicts. This clause ensures federal officials can enforce national policies without state obstruction. A distractor like E misuses the Tenth Amendment, claiming reserved powers let states prevail, but reserved powers apply only where federal authority is absent, not in conflicts. For approach, remember: enumerated powers authorize federal laws; implied powers expand them; reserved powers are state-exclusive; concurrent powers allow both, but Supremacy Clause resolves overlaps in favor of federal law.

Question 2

Congress offers highway funds only if states raise the drinking age. What federalism tool is shown?

  1. Unfunded mandate; Congress orders states to change drinking laws without offering resources, relying on the Supremacy Clause to force compliance.
  2. Conditional grants-in-aid; Congress uses the Spending Power to encourage state policy changes by attaching conditions to federal funds. (correct answer)
  3. Block grant; Congress gives states money with no strings attached, letting each state decide whether to raise the drinking age.
  4. Commandeering; Congress requires state legislatures to pass a drinking-age law and threatens criminal penalties for state officials who refuse.
  5. Reserved powers; states may accept federal funds only if Congress enumerates a drinking-age power in Article I, Section 8.

Explanation: This question probes the skill of identifying tools of cooperative federalism in the state-national relationship, such as how Congress influences state policy without direct mandates. The federal system allows Congress to use fiscal incentives to encourage state alignment with national goals, blending authority levels. The correct answer, B, describes conditional grants-in-aid, where Congress leverages its Spending Power to attach conditions like raising the drinking age to highway funds, as upheld in South Dakota v. Dole. This tool promotes cooperation without coercion, provided conditions relate to the grant's purpose and are not unduly coercive. A distractor like D mislabels it as commandeering, which involves forcing states to enforce federal laws, but here states voluntarily comply for funds. To solve these, know powers: enumerated Spending Power in Article I, Section 8; implied powers to implement; reserved state powers over issues like drinking ages; and concurrent powers, with grants fostering shared implementation.

Question 3

New York grants one ferry company exclusive rights between NY and NJ; Congress licenses a competitor. Which clause applies?

  1. Commerce Clause as interpreted in Gibbons v. Ogden: federal licensing of interstate navigation preempts conflicting state-created monopolies. (correct answer)
  2. Establishment Clause: New York’s monopoly is unconstitutional because it establishes an official business favored by the state.
  3. Privileges and Immunities Clause: New York may exclude out-of-state ferry operators so long as it treats New Yorkers equally.
  4. Tenth Amendment reserved powers: navigation is purely intrastate, so Congress cannot regulate ferries crossing state lines.
  5. Spending Clause: Congress must attach conditions to highway funds before it can regulate any transportation activity.

Explanation: This question examines federal preemption in interstate commerce. The scenario reflects Gibbons v. Ogden (1824), where New York's steamboat monopoly conflicted with federal licensing. The Supreme Court held that the Commerce Clause gives Congress power over interstate navigation, preempting conflicting state monopolies. Option A correctly identifies this principle. Option B incorrectly invokes the Establishment Clause (about religion), option C misunderstands the Privileges and Immunities Clause, option D wrongly claims navigation is purely intrastate, and option E incorrectly requires spending conditions for commerce regulation.

Question 4

Congress bans guns near schools, citing national crime effects; a defendant challenges it. Which case best fits?

  1. McCulloch v. Maryland: because schools are important, Congress may use implied powers to regulate any activity affecting education.
  2. Gibbons v. Ogden: navigation monopolies are invalid, so firearm restrictions near schools are automatically interstate commerce regulation.
  3. United States v. Lopez: the Commerce Clause has limits; gun possession near schools is not economic activity substantially affecting commerce. (correct answer)
  4. NFIB v. Sebelius: Congress may compel individuals to purchase firearms insurance under the Commerce Clause to reduce crime costs.
  5. Full Faith and Credit Clause: states must recognize each other’s gun laws, so Congress may regulate schools directly.

Explanation: This question tests Commerce Clause limitations established in United States v. Lopez (1995). The Gun-Free School Zones Act was struck down because mere possession of a firearm near schools is not economic activity that substantially affects interstate commerce. Option C correctly identifies this landmark case limiting federal power. Option A misapplies McCulloch's implied powers doctrine, option B incorrectly connects Gibbons to gun regulation, option D mischaracterizes NFIB v. Sebelius, and option E wrongly invokes the Full Faith and Credit Clause.

Question 5

Congress offers highway funds only if states raise the drinking age to 21. Which power and limit are illustrated?

  1. Commerce Clause preemption; Gibbons v. Ogden allows Congress to require uniform drinking ages because alcohol moves in interstate commerce.
  2. Spending power with conditions; South Dakota v. Dole permits related, non-coercive funding incentives to influence state policy choices. (correct answer)
  3. Reserved powers; United States v. Lopez bars Congress from attaching any conditions to grants, so the offer is unconstitutional.
  4. Anti-commandeering; Printz v. United States forbids Congress from offering money to states, because it forces state legislatures to act.
  5. Necessary and Proper Clause; McCulloch v. Maryland requires states to comply with all federal preferences whenever funds are available.

Explanation: This question addresses Congress's spending power and conditional federal grants. South Dakota v. Dole (1987) established that Congress can attach conditions to federal funding to influence state policy, but with limitations: conditions must be related to the federal interest, clearly stated, and not unduly coercive. The Court upheld the highway funding condition tied to raising the drinking age because it was reasonably related to highway safety and only withheld a small percentage of funds. Answer B correctly identifies this as an exercise of spending power with appropriate limits. The anti-commandeering doctrine (Answer D) doesn't apply because Congress isn't commanding states directly—states can choose to forgo the funds.

Question 6

Congress orders state police to run federal background checks for handgun purchases. Which doctrine and case are most relevant?

  1. Supremacy Clause; McCulloch v. Maryland requires state executive officers to execute federal programs because federal law is supreme.
  2. Spending Clause; South Dakota v. Dole allows Congress to command state police directly, without offering funds, if the goal is national safety.
  3. Anti-commandeering; Printz v. United States holds Congress cannot compel state executive officials to administer or enforce federal regulatory programs. (correct answer)
  4. Commerce Clause; Gibbons v. Ogden requires states to implement federal checks because firearms are articles of commerce.
  5. Necessary and Proper Clause; NFIB v. Sebelius permits Congress to conscript state officials whenever implementation is convenient.

Explanation: This question tests the anti-commandeering doctrine established in Printz v. United States (1997). In Printz, the Court struck down provisions of the Brady Act that required state law enforcement to conduct background checks for handgun purchases. The Court held that Congress cannot commandeer state executive officials to implement federal regulatory programs. This principle protects state sovereignty and prevents the federal government from shifting implementation costs to states without their consent. Answer C correctly identifies both the anti-commandeering doctrine and the Printz precedent. Congress can incentivize state cooperation through spending conditions but cannot directly command state officers to enforce federal law.

Question 7

Congress bans guns near schools citing national economic effects; a state argues education policing is local. Which case fits?

  1. Commerce Clause broadly interpreted; Wickard v. Filburn would uphold the law because any local activity can be aggregated into commerce.
  2. Fourteenth Amendment enforcement; Brown v. Board authorizes Congress to criminalize gun possession near schools to protect equal education.
  3. Limits on Commerce Clause; United States v. Lopez strikes down non-economic criminal regulation lacking substantial interstate commerce connection. (correct answer)
  4. Necessary and Proper Clause; McCulloch v. Maryland requires courts to defer whenever Congress claims a helpful means, no matter the subject.
  5. Spending Clause coercion; NFIB v. Sebelius invalidates all federal criminal laws that states dislike as overly coercive.

Explanation: This question tests knowledge of Commerce Clause limitations established in United States v. Lopez (1995). In Lopez, the Supreme Court struck down the Gun-Free School Zones Act, marking the first time in decades that the Court found Congress exceeded its Commerce Clause authority. The Court held that possessing a gun near a school is not economic activity and lacks a substantial connection to interstate commerce. This case established that Congress cannot regulate non-economic, purely local activities simply by claiming theoretical effects on commerce. Answer C correctly identifies Lopez as limiting the Commerce Clause for non-economic criminal regulations. The other options either overstate federal power or misapply constitutional doctrines.

Question 8

A state requires a license for immigration consultants; Congress sets national immigration rules. Which power division is most accurate?

  1. Concurrent powers: immigration is jointly regulated, so states may set any immigration standards even if Congress has legislated differently.
  2. Exclusive national power over naturalization and immigration: federal policy predominates, and conflicting state regulations risk preemption. (correct answer)
  3. Reserved state police power: immigration is primarily local, so federal rules apply only at the border, not inside states.
  4. Interstate compacts: states may regulate immigration only by forming compacts approved by Congress, otherwise no regulation is allowed.
  5. McCulloch v. Maryland: implied powers give states authority to create immigration agencies that can override federal naturalization standards.

Explanation: This question examines the division of power over immigration between federal and state governments. The Constitution grants Congress exclusive power over naturalization in Article I, Section 8, and the Supreme Court has consistently held that immigration regulation is primarily a federal responsibility due to its foreign policy implications and need for national uniformity. While states may have some authority to regulate businesses within their borders, including immigration consultants, such regulations cannot conflict with federal immigration policy and are subject to preemption if they interfere with federal objectives. The federal government's predominance in immigration matters stems from both enumerated powers and the inherent sovereignty of the national government in foreign affairs. States cannot create their own immigration policies that contradict federal law.

Question 9

Congress creates a new federal agency to administer elections and requires state officials to run it. Which doctrine is implicated?

  1. Anti-commandeering principle: Congress generally may not require state executive officials to administer or enforce a federal regulatory program. (correct answer)
  2. Necessary and Proper Clause: Congress may always order state officials to carry out federal laws, regardless of state consent.
  3. Supremacy Clause: any federal request becomes mandatory for state officials, even without a federal statute commanding compliance.
  4. Full Faith and Credit: states must recognize federal agency actions, so they must also staff and administer the agency.
  5. Commerce Clause: election administration substantially affects commerce, so Congress may conscript state workers to implement the program.

Explanation: This question directly implicates the anti-commandeering doctrine established in cases like Printz v. United States (1997) and New York v. United States (1992). The Tenth Amendment and principles of federalism prohibit Congress from commandeering state executive or legislative processes by requiring state officials to administer federal regulatory programs. While Congress has broad powers under the Necessary and Proper Clause, it cannot conscript state officers to enforce federal law or require states to enact particular legislation. Congress must use its own federal officers or incentivize voluntary state cooperation through spending conditions. This doctrine preserves state sovereignty and prevents the federal government from shifting the political and financial costs of federal programs to the states.

Question 10

Congress bans guns near schools, citing crime’s economic effects, though no interstate element is required. Which case fits?

  1. Gibbons v. Ogden: Congress may regulate all local activity affecting navigation, including school-zone gun possession, under broad commerce power.
  2. United States v. Lopez: non-economic gun possession near schools exceeds Commerce Clause authority without a substantial interstate commerce link. (correct answer)
  3. McCulloch v. Maryland: Necessary and Proper Clause authorizes any criminal law Congress deems useful, regardless of enumerated powers limits.
  4. NFIB v. Sebelius: Congress may regulate inactivity, so it may ban guns near schools even with no commerce connection.
  5. Full Faith and Credit Clause: states must honor other states’ gun laws, so Congress may standardize school firearm rules nationwide.

Explanation: This question tests understanding of Commerce Clause limits established in United States v. Lopez (1995). The Gun-Free School Zones Act banned firearms near schools without requiring any connection to interstate commerce. The Supreme Court struck it down, holding that non-economic criminal conduct with no substantial effect on interstate commerce exceeds Congress's Commerce Clause authority. This marked the first Commerce Clause limitation since 1937, distinguishing between economic activities that substantially affect interstate commerce (which Congress can regulate) and non-economic local activities (which it cannot). Gibbons involved actual interstate commerce, McCulloch's Necessary and Proper Clause still requires a valid enumerated power, NFIB dealt with compelling activity not banning it, and Full Faith and Credit is irrelevant to federal criminal law. Strategy: Post-Lopez, Congress must show a substantial connection between regulated activity and interstate commerce, especially for non-economic conduct.

Question 11

Two states sign an agreement to share river water; Congress approves it. What is this arrangement called?

  1. Interstate compact; states may negotiate agreements with each other, typically requiring congressional consent to address shared policy problems. (correct answer)
  2. Nullification ordinance; a state may invalidate federal water regulations, and congressional approval makes the state decision binding nationwide.
  3. Extradition request; states must return escaped water rights violators, and Congress approves to ensure uniform criminal enforcement.
  4. Block grant; Congress gives water money to states, and states sign a contract to spend it without federal oversight.
  5. Preemption doctrine; Congress cancels state water laws by approving them, replacing state regulation with exclusive federal control.

Explanation: This question evaluates the skill of understanding interstate agreements in federalism, showing how states collaborate with national oversight. The state-national relationship permits states to address shared issues jointly, but often requires federal approval to avoid undermining national interests. The correct answer, A, identifies an interstate compact, where states agree on matters like water sharing, and congressional consent makes it enforceable, as per Article I, Section 10. This mechanism fosters cooperation on transboundary problems without federal domination. A distractor like E misapplies preemption, suggesting Congress cancels state laws by approving, but compacts integrate state initiatives with federal sanction. To tackle these, recall: enumerated congressional consent power; implied implementation; reserved state negotiation rights; concurrent resource management, with compacts bridging state and national levels.

Question 12

Congress charters a national bank; a state taxes it to control lending. Which principle applies?

  1. Dual federalism; states may tax federal instruments because reserved powers let them supervise national economic policy within their borders.
  2. McCulloch v. Maryland; Supremacy Clause and implied powers mean states cannot tax legitimate federal institutions to impede national authority. (correct answer)
  3. Gibbons v. Ogden; the Commerce Clause allows states to regulate interstate waterways even when Congress has created a national bank.
  4. United States v. Lopez; Congress lacks authority over economic matters, so states may tax federal entities absent a specific enumerated power.
  5. NFIB v. Sebelius; the Taxing Power lets states impose taxes on federal programs if they do not commandeer state officials.

Explanation: This question tests the skill of understanding the relationship between states and the national government in AP US Government and Politics, focusing on federal supremacy and the limits of state power over federal institutions. In the U.S. federal system, the national government holds supremacy in areas of enumerated and implied powers, preventing states from interfering with legitimate federal operations. The correct answer, B, refers to McCulloch v. Maryland, where the Supreme Court ruled that states cannot tax federal banks because it would impede national authority under the Supremacy Clause and the Necessary and Proper Clause for implied powers. This case established that the national bank's creation was constitutional as an implied power to carry out enumerated fiscal powers in Article I, Section 8. A common distractor, like choice A, misapplies dual federalism by suggesting states have reserved powers to tax federal instruments, but this ignores federal supremacy and the prohibition on destructive state taxation. To approach such questions, remember the types of powers: enumerated powers are explicitly listed in Article I, Section 8; implied powers come from the Necessary and Proper Clause; reserved powers are held by states under the 10th Amendment; and concurrent powers, like taxation, are shared but cannot be used by states to undermine federal functions.

Question 13

A state legalizes marijuana, but federal law still bans it; federal agents enforce the ban. What relationship is shown?

  1. Interposition; state legalization automatically blocks federal enforcement within state borders because states are equal sovereigns in criminal law.
  2. Preemption under the Supremacy Clause; when federal and state laws conflict, federal enforcement may proceed despite state legalization. (correct answer)
  3. Full Faith and Credit; federal agents must honor the state’s legalization policy and treat marijuana possession as lawful nationwide.
  4. Privileges and Immunities; residents of other states may sue to force federal legalization because they are entitled to equal benefits.
  5. Reserved police powers; state criminal codes always override federal statutes because public safety regulation is exclusively state authority.

Explanation: This question probes the skill of applying supremacy in federal-state conflicts over criminal laws, illustrating persistent federal authority despite state policies. In federalism, state decriminalization does not nullify federal bans, maintaining dual sovereignty in enforcement. The correct answer, B, explains preemption under the Supremacy Clause, allowing federal agents to enforce bans like marijuana prohibition even in legalizing states, as federal law trumps conflicting state statutes. This reflects ongoing tensions in areas like drug policy where powers overlap. A distractor such as E incorrectly asserts reserved police powers override federal law, but while states have primary criminal authority, federal enumerated powers (e.g., commerce) enable national regulations that preempt. Strategically, differentiate: enumerated federal commerce power; implied enforcement; reserved state police powers; concurrent regulation, resolved by Supremacy Clause in conflicts.

Question 14

Congress creates a national service program without listing it in Article I; it argues it helps execute enumerated powers. What is this?

  1. Implied power via the Necessary and Proper Clause: Congress may adopt reasonable means to carry out enumerated powers even if not explicitly listed. (correct answer)
  2. Reserved power under the Tenth Amendment: only states may create service programs because all unlisted powers automatically belong to states.
  3. Inherent presidential power: the executive branch may create domestic programs without Congress because it controls administration.
  4. Full Faith and Credit: states must honor each other’s service requirements, so Congress may impose them nationally.
  5. Commerce Clause limitation from Lopez: Congress may only regulate non-economic activity, so a service program is unconstitutional by definition.

Explanation: This question tests understanding of implied powers under the Necessary and Proper Clause. Congress may adopt reasonable means to execute its enumerated powers even if those means aren't explicitly listed in the Constitution. Option A correctly identifies this implied power principle from McCulloch v. Maryland. Option B wrongly claims all unlisted powers belong to states, option C incorrectly invokes inherent presidential power, option D misapplies Full Faith and Credit, and option E mischaracterizes the Lopez limitation.

Question 15

Congress sets a 21 drinking age by conditioning highway grants on compliance. What power is primarily used?

  1. Spending power: Congress may attach conditions to federal funds offered to states, encouraging compliance without directly mandating state law changes. (correct answer)
  2. Police power: Congress has general authority to regulate public safety and morals inside states, including alcohol consumption ages.
  3. Treaty power: Congress may set drinking ages by signing international agreements that automatically override state alcohol regulations.
  4. Reserved power: the Tenth Amendment requires states to accept federal transportation money when offered, regardless of conditions.
  5. Judicial review: the Supreme Court can set nationwide drinking ages directly, so Congress uses courts rather than funding conditions.

Explanation: This question examines Congress's spending power to influence state policy. South Dakota v. Dole (1987) upheld conditioning highway funds on states adopting a 21-year drinking age, establishing that Congress may attach reasonable conditions to federal grants. Option A correctly identifies the spending power. Option B incorrectly claims Congress has general police power (reserved to states), option C wrongly invokes treaty power, option D misunderstands the Tenth Amendment, and option E incorrectly suggests courts set drinking ages.

Question 16

Congress creates environmental rules; states administer them under federal guidelines with shared funding. What federalism type is this?

  1. Dual federalism: federal and state governments act separately with no overlap, so states cannot administer federal environmental programs.
  2. Cooperative federalism: national standards and funding combine with state implementation, creating shared responsibility in overlapping policy areas. (correct answer)
  3. Confederalism: states dominate the national government, so federal guidelines are merely suggestions without binding force.
  4. Competitive federalism: states and the federal government never share funds, and each independently regulates the same pollution sources.
  5. Judicial federalism: courts, not legislatures, write environmental rules, so agencies cannot coordinate across government levels.

Explanation: This question tests understanding of federalism models. The scenario describes cooperative federalism, where federal and state governments work together—Congress sets standards and provides funding while states implement programs. Option B correctly identifies this modern federalism approach. Option A describes dual federalism (separate spheres), option C describes confederalism (state dominance), option D mischaracterizes competitive federalism, and option E incorrectly claims courts write environmental rules rather than legislatures.

Question 17

A state signs a trade agreement with a foreign country to lower tariffs on imported steel. Which constitutional rule is implicated?

  1. States’ reserved foreign affairs power: the Tenth Amendment permits independent state treaties when aimed at local economic development goals.
  2. Concurrent power: both state and federal governments may negotiate treaties, but the Supremacy Clause breaks ties if conflicts arise.
  3. Article I, Section 10 prohibition: states may not enter treaties or compacts with foreign powers without congressional consent, reflecting national supremacy in foreign relations. (correct answer)
  4. Commerce Clause: states may set tariffs as long as they do not burden interstate commerce, so foreign tariffs are a state police power.
  5. Necessary and Proper Clause: states can create international agreements as implied powers to carry out their taxing authority efficiently.

Explanation: This question tests knowledge of constitutional limits on state powers in foreign affairs. Article I, Section 10 explicitly prohibits states from entering into treaties, alliances, or confederations with foreign powers. States may enter into compacts with foreign powers only with congressional consent. This prohibition reflects the Founders' intent to centralize foreign policy authority in the national government to ensure the United States speaks with one voice internationally. Answer C correctly identifies this constitutional prohibition and the principle of national supremacy in foreign relations. States don't have reserved powers in foreign affairs (Answer A), and the Commerce Clause doesn't authorize state tariff agreements with foreign nations.

Question 18

A state grants one company an exclusive steamboat license on interstate waters; Congress regulates navigation differently. What applies?

  1. Commerce Clause power over interstate navigation; Gibbons v. Ogden invalidates the state monopoly when it conflicts with federal law. (correct answer)
  2. Necessary and Proper Clause; McCulloch v. Maryland requires states to share navigation authority equally with Congress.
  3. Privileges and Immunities Clause; Saenz v. Roe bars states from favoring in-state boat operators over out-of-state competitors.
  4. Tenth Amendment reserved powers; United States v. Lopez confirms transportation licensing is purely local, so the monopoly is valid.
  5. Full Faith and Credit Clause; Obergefell v. Hodges requires states to recognize federal navigation permits as marriages.

Explanation: This question examines the Commerce Clause and federal preemption of state regulations. The scenario mirrors Gibbons v. Ogden (1824), where New York granted a steamboat monopoly that conflicted with federal navigation licenses. The Supreme Court established that Congress has broad power over interstate commerce, including navigation between states. When valid federal law conflicts with state law in an area of federal authority, the Supremacy Clause requires the federal law to prevail. Answer A correctly identifies that the Commerce Clause gives Congress power over interstate navigation and that Gibbons invalidates conflicting state monopolies. The other options misapply constitutional provisions or cases to this commerce scenario.

Question 19

A state requires online sellers to collect a special tax on all interstate shipments; Congress has not acted. What relationship is shown?

  1. Exclusive federal commerce power: the Commerce Clause always bars states from touching interstate trade, so the tax is automatically unconstitutional.
  2. Concurrent power with potential dormant Commerce Clause issues: states may tax and regulate, but cannot unduly burden or discriminate against interstate commerce. (correct answer)
  3. Reserved power: taxation affecting interstate shipments is purely local, so federal courts must uphold it regardless of burden on other states.
  4. Implied power: states possess implied powers under Necessary and Proper Clause, allowing them to regulate national markets when Congress is silent.
  5. Unitary system characteristic: states are administrative units of Congress, so the tax is valid only if Congress explicitly authorizes it.

Explanation: This question examines state taxation powers and the dormant Commerce Clause doctrine. States have concurrent power to tax and regulate commerce, but the dormant Commerce Clause (implied from the Commerce Clause) limits state actions that discriminate against or unduly burden interstate commerce, even when Congress hasn't acted. States may impose taxes on interstate transactions if they are fairly apportioned, non-discriminatory, and reasonably related to services provided by the state. Answer B correctly identifies this as concurrent power subject to dormant Commerce Clause limitations. The Commerce Clause doesn't create exclusive federal power (Answer A), and states aren't completely barred from affecting interstate commerce when Congress is silent.

Question 20

A state legalizes marijuana, but federal law prohibits possession and sale. Which relationship outcome is most consistent?

  1. State nullification: states may invalidate federal criminal laws within their borders whenever voters approve a conflicting policy by referendum.
  2. Preemption under the Supremacy Clause: valid federal prohibition can be enforced, though states may choose not to assist enforcement. (correct answer)
  3. Privileges and Immunities: state legalization guarantees residents immunity from federal prosecution for activities legal under state law.
  4. Lopez limitation: Congress cannot criminalize any drug possession because it is noncommercial, so federal marijuana law is void.
  5. Gibbons v. Ogden: states control all intrastate sales, so federal drug laws apply only to transactions crossing state lines.

Explanation: This question addresses the tension between state marijuana legalization and federal prohibition under the Controlled Substances Act. Under the Supremacy Clause, valid federal law preempts contrary state law, so federal authorities can still enforce federal marijuana prohibition even in states that have legalized it. However, the anti-commandeering doctrine means states cannot be forced to enforce federal drug laws—they may choose not to prosecute marijuana offenses under state law or assist federal enforcement. This creates a practical situation where conduct may be legal under state law but remain illegal under federal law. The federal government retains authority to prosecute violations using federal resources, but cannot compel state participation in enforcement efforts.