AP World History Modern Quiz: Effects Of The Cold War

What this quiz covers

This quiz focuses on Effects Of The Cold War, giving you a quick way to practice the rules, question types, and explanations that matter most for AP World History Modern.

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.

Question 1

1. The United Nations eliminated national armies worldwide, preventing regional conflicts and making ideological competition largely irrelevant to postcolonial states' politics.
2. Superpower competition encouraged proxy conflicts and interventions, as rival blocs armed and funded factions in places like Korea, Vietnam, Angola, and Afghanistan. (correct answer)
3. European empires reestablished direct colonial rule after 1945 because the United States and USSR jointly opposed self-determination movements in Asia and Africa.
4. Most newly independent states refused all foreign aid and formed a single global federation that replaced ideological blocs and ended military alliances.
5. Cold War rivalry ended international trade, replacing markets with complete autarky as governments banned imports to avoid ideological contamination.

Explanation: The Cold War's impact on decolonizing regions was characterized by superpower competition that often turned local conflicts into proxy wars. Option B correctly identifies this pattern, where the US and USSR armed and funded opposing factions in conflicts across Asia and Africa. In Korea, the US backed the South while the USSR and China supported the North, leading to a devastating war. Vietnam saw similar dynamics with US support for South Vietnam against the communist North. In Africa, Angola became a Cold War battleground with Soviet and Cuban support for the MPLA while the US backed UNITA. Afghanistan witnessed Soviet invasion countered by US support for the mujahideen. These proxy conflicts prolonged violence, complicated decolonization, and often prioritized superpower interests over local needs.

Question 2

1. Perestroika, a Soviet reform program that decentralized planning and expanded openness, widely credited with ending political repression in the United States.
2. McCarthyism, characterized by aggressive anti-communist hearings and accusations that pressured institutions to purge suspected subversives without due process. (correct answer)
3. Negritude, a cultural movement celebrating African identity that primarily targeted U.S. labor unions for supporting capitalist consumer culture.
4. The Cultural Revolution, a Chinese mass campaign that directly replaced U.S. congressional authority with revolutionary committees in Washington, D.C.
5. The Great Leap Forward, an American agricultural collectivization plan designed to raise steel output and reduce reliance on imported consumer goods.

Explanation: McCarthyism (Option B) accurately describes the aggressive anti-communist campaign in the United States during the early 1950s. Named after Senator Joseph McCarthy, this movement was characterized by congressional hearings, particularly by the House Un-American Activities Committee, that targeted alleged communists in government, entertainment, and education. The campaign often relied on unsubstantiated accusations, guilt by association, and pressure to name others. Many careers were destroyed through blacklists, and the atmosphere of fear led to self-censorship and conformity. McCarthyism demonstrated how Cold War tensions could undermine civil liberties and due process within democratic societies, showing that the conflict's effects extended far beyond foreign policy into domestic politics and culture.

Question 3

1. Mutually Assured Destruction (MAD), the deterrence concept that second-strike capability made full-scale nuclear war irrational for both superpowers. (correct answer)
2. The domino theory, which argued nuclear weapons would automatically spread to every country once one state tested a bomb, regardless of alliances.
3. Manifest Destiny, which justified U.S. territorial expansion in the nineteenth century and directly created Soviet nuclear policy after 1945.
4. Cultural relativism, which claimed nuclear weapons were harmless symbols whose meaning depended on local traditions rather than military capabilities.
5. Collectivization, which ensured nuclear stability by reorganizing farms into state-run units that could rapidly produce uranium and missile parts.

Explanation: Mutually Assured Destruction (MAD) was the Cold War deterrence concept that prevented nuclear war between superpowers (Option A). MAD recognized that both the US and USSR had developed sufficient nuclear arsenals and delivery systems to ensure that even after absorbing a first strike, either could retaliate with devastating force. This second-strike capability made initiating nuclear war irrational, as it would result in the destruction of both nations. MAD influenced strategic planning, arms control negotiations, and crisis management throughout the Cold War. While this balance of terror prevented direct superpower conflict, it also led to massive arsenals, proxy wars, and the constant threat of accidental war. The concept fundamentally shaped international relations by making great power war potentially suicidal.

Question 4

1. The Non-Aligned Movement, which promoted neutrality, decolonization, and independent development strategies while seeking support without formal bloc membership. (correct answer)
2. The Congress of Vienna system, which restored monarchies after Napoleon and required Asian and African states to accept European protectorates.
3. The Axis alliance, which reorganized after 1945 to oppose both superpowers and revive territorial empires through coordinated invasions.
4. The Bretton Woods system, which required all countries to adopt communism in exchange for fixed exchange rates and postwar reconstruction loans.
5. The Concert of Europe, which coordinated nuclear deterrence strategies among colonial empires and prevented independence movements from forming.

Explanation: The Non-Aligned Movement (Option A) best represents the effort by many Asian and African states to avoid formal alignment with either superpower bloc during the Cold War. Founded at the Bandung Conference in 1955 and formalized in Belgrade in 1961, the movement included leaders like Nehru, Nasser, Tito, and Sukarno. These nations sought to maintain independence, pursue their own development paths, and avoid being drawn into superpower conflicts. While members often accepted aid from both sides and sometimes leaned toward one bloc or another, they rejected formal military alliances and promoted solidarity among developing nations. The Non-Aligned Movement created a "third way" in international politics and demonstrated that not all states accepted the bipolar Cold War framework.

Question 5

1. European empires reestablished direct colonial rule over most of Africa, justified by the need to contain communism and restore prewar trade monopolies.
2. New states frequently received superpower aid tied to ideological alignment, turning local conflicts into proxy struggles and shaping postcolonial regimes and borders. (correct answer)
3. The Soviet Union and United States jointly created a single global army that replaced national militaries to prevent another world war.
4. Nonaligned leaders rejected all foreign assistance, eliminating external influence and allowing rapid economic convergence among newly independent countries.
5. Cold War competition ended international arms production, since nuclear deterrence made conventional forces and weapons unnecessary after 1945.

Explanation: The correct answer is B, which accurately describes how Cold War bipolarity directly affected decolonizing regions. During the Cold War, both the United States and Soviet Union competed for influence in newly independent states by offering economic aid, military assistance, and political support tied to ideological alignment. This superpower competition transformed local conflicts into proxy wars, as seen in Vietnam, Angola, and Afghanistan, where regional disputes became internationalized through superpower involvement. The aid packages often came with strings attached, requiring recipients to adopt certain political or economic models, which shaped postcolonial regimes and sometimes influenced border disputes. This pattern represents a direct effect of the bipolar world order on decolonization, as new states had to navigate between the two superpowers while trying to establish their sovereignty.

Question 6

1. Proxy wars allowed superpowers to compete for influence while reducing the risk of direct nuclear confrontation, using local allies to fight on their behalf. (correct answer)
2. Proxy wars were mandated by the United Nations, which required all member states to settle disputes by sponsoring insurgencies in neighboring countries.
3. Proxy wars occurred because nuclear weapons made all conventional weapons obsolete, forcing armies to rely only on guerrilla tactics everywhere.
4. Proxy wars were primarily caused by the return of European colonial armies, which fought each other directly to regain lost empires after 1945.
5. Proxy wars ended quickly because both superpowers refused to provide arms, insisting that local conflicts remain isolated from global politics.

Explanation: The correct answer is A, which explains that proxy wars allowed superpowers to compete for influence while avoiding direct nuclear confrontation. The development of nuclear weapons created a paradox: while the superpowers had unprecedented destructive capability, they could not risk direct military conflict without potentially triggering mutual annihilation. Proxy wars became the solution to this dilemma, allowing the United States and Soviet Union to pursue their geopolitical goals by supporting local allies with weapons, advisors, and funding. This indirect competition maintained the rivalry while keeping it below the nuclear threshold, as seen in Korea, Vietnam, and Afghanistan. The proxy war strategy reflected the constraints imposed by nuclear deterrence on traditional great power competition.

Question 7

1. A pattern of U.S.-backed interventions and support for anti-communist regimes, contributing to coups and authoritarian rule in the name of containment. (correct answer)
2. The rapid disappearance of militaries across the region, since the Cold War encouraged demilitarization and prohibited foreign security assistance.
3. Complete insulation from global politics, as Latin American states avoided any ideological influence and experienced no significant external involvement.
4. Direct annexation of Latin American countries by European empires, which returned to the region to rebuild colonial administrations after 1945.
5. A universal shift to communist one-party states, because U.S. influence ended immediately and all governments joined the Warsaw Pact.

Explanation: The correct answer is A, which accurately characterizes the pattern of U.S.-backed interventions and support for anti-communist regimes in Latin America during the Cold War. The United States, invoking the Monroe Doctrine and containment policy, actively intervened in Latin American politics to prevent perceived communist expansion. This included supporting coups against democratically elected governments (as in Guatemala 1954 and Chile 1973), backing authoritarian regimes that claimed to be anti-communist, and providing military training and aid through programs like the School of the Americas. The justification of containment often overrode concerns about democracy or human rights, leading to decades of military dictatorships in countries like Brazil, Argentina, and El Salvador. This interventionist pattern represents a major effect of Cold War ideology on Latin American political development.

Question 8

1. The consolidation of a unified communist bloc from Berlin to Beijing under a single party, eliminating national borders and creating one European state.
2. The dissolution of Soviet control over Eastern Europe, enabling political revolutions, new national governments, and economic restructuring away from central planning. (correct answer)
3. The restoration of absolutist monarchies across Eastern Europe, as Soviet leaders invited royal families back to rule as allies against capitalism.
4. The immediate end of all military alliances worldwide, since NATO and other organizations were outlawed by a universal peace treaty in 1991.
5. A return to European overseas empire-building, as decolonization reversed and African and Asian colonies were reoccupied by Eastern European states.

Explanation: The correct answer is B, which identifies the dissolution of Soviet control over Eastern Europe as the most direct reflection of the Cold War's end. Between 1989 and 1991, the weakening of Soviet power enabled a series of political revolutions across Eastern Europe, beginning with Poland's Solidarity movement and culminating in the fall of the Berlin Wall. Communist governments collapsed in rapid succession, replaced by multiparty democracies that pursued market reforms and integration with Western Europe. The Warsaw Pact dissolved, and former Soviet satellites regained full sovereignty, with many eventually joining NATO and the European Union. This transformation from Soviet-controlled communist states to independent democracies pursuing market economies represents the most fundamental geopolitical change resulting from the Cold War's end in Europe.

Question 9

1. NATO, a collective defense alliance in which an attack on one member was treated as an attack on all, strengthening Western deterrence. (correct answer)
2. COMECON, an economic coordination council that replaced all national currencies with a single ruble and abolished military alliances in Europe.
3. The Warsaw Pact, created by Western European states in 1949 to contain U.S. influence and prevent American bases on the continent.
4. The League of Nations, revived after 1945 to administer Germany permanently and to enforce global disarmament through mandatory inspections.
5. The Organization of American States, founded to integrate European armies and coordinate nuclear sharing among France, Britain, and West Germany.

Explanation: NATO (North Atlantic Treaty Organization), established in 1949, was the premier US-led collective defense alliance created to deter Soviet aggression in Europe (Option A). The alliance's Article 5 established that an attack on one member would be considered an attack on all, creating a powerful deterrent through collective security. NATO formalized the Western alliance system, stationed US troops permanently in Europe, and coordinated defense planning among member states. The Soviet Union responded by creating the Warsaw Pact in 1955, institutionalizing the division of Europe. NATO's creation marked a departure from traditional US isolationism and committed America to European defense throughout the Cold War and beyond.

Question 10

1. U.S. involvement in the 1954 Guatemalan coup reflected anticommunist containment, contributing to regime change and long-term instability in the country. (correct answer)
2. The Aztec Empire's conquest of neighboring city-states showed Cold War containment by using television propaganda and foreign aid to spread ideology.
3. The Treaty of Tordesillas divided the Americas between Spain and Portugal, creating NATO-aligned governments and Soviet-backed insurgencies in the 1490s.
4. The Haitian Revolution led directly to the Organization of American States, which eliminated all military dictatorships through binding international court rulings.
5. The Monroe Doctrine ended Cold War rivalry by guaranteeing neutrality for all Latin American states and banning foreign investment from both blocs.

Explanation: The 1954 CIA-orchestrated coup in Guatemala perfectly demonstrates Cold War intervention in Latin American politics. Answer (A) correctly identifies this event, where the US overthrew the democratically elected government of Jacobo Árbenz because his land reform policies threatened United Fruit Company interests and were interpreted as communist-inspired. The CIA's Operation PBSUCCESS installed a military dictatorship that reversed social reforms and initiated decades of repression, culminating in genocidal violence against indigenous populations in the 1980s. This pattern repeated across Latin America - the US supported coups in Brazil (1964), Chile (1973), and Argentina (1976), while backing authoritarian regimes in Nicaragua, El Salvador, and elsewhere. The Soviet Union and Cuba countered by supporting revolutionary movements, creating a cycle of intervention, repression, and insurgency. These foreign interventions profoundly shaped Latin American development, often prioritizing anticommunism over democracy or human rights.

Question 11

1. The Cuban Missile Crisis, which led primarily to agricultural reforms and reduced federal funding for physics and engineering programs across the United States.
2. The Soviet launch of Sputnik, which spurred U.S. initiatives like NASA expansion and education reforms emphasizing mathematics and scientific training. (correct answer)
3. The Yalta Conference, which created a permanent global space agency under the United Nations to coordinate peaceful exploration without rivalry.
4. The fall of the Berlin Wall, which immediately redirected U.S. resources away from technology and into rebuilding Eastern European heavy industry.
5. The creation of OPEC, which increased oil prices and therefore eliminated public interest in satellites and long-term scientific research.

Explanation: The Soviet launch of Sputnik in 1957 (Option B) shocked the United States and directly triggered massive investments in science education and space technology. This first artificial satellite demonstrated Soviet technological capability and suggested they might gain military advantages through space. The US response was swift and comprehensive: Congress passed the National Defense Education Act to fund science and mathematics education, NASA was created in 1958, and federal funding for research universities expanded dramatically. The "Sputnik moment" transformed American education policy and initiated the Space Race, which became a highly visible arena for demonstrating technological superiority. This competition ultimately led to the moon landing and permanently changed how the US approached scientific research and education.

Question 12

1. Most postcolonial states abandoned industrialization entirely, because superpowers required them to remain agricultural exporters under strict noninterference rules.
2. Superpower aid and loans often encouraged states to adopt either market-oriented or socialist planning models, shaping development strategies and trade partners. (correct answer)
3. Cold War rivalry eliminated foreign investment, since both blocs agreed that private capital and state planning were equally harmful to growth.
4. Economic policy became irrelevant, because nuclear deterrence prevented any competition over resources, markets, or strategic infrastructure after 1945.
5. Newly independent states universally adopted laissez-faire policies, because Soviet influence collapsed immediately and U.S. aid required minimal government activity.

Explanation: The correct answer is B, which accurately connects Cold War rivalry to economic policy choices in newly independent states. During the Cold War, superpowers used economic aid and development assistance as tools of influence, encouraging states to adopt either market-oriented capitalism or socialist central planning. The United States promoted its model through institutions like the World Bank and IMF, while the Soviet Union offered technical assistance and support for state-led industrialization. Many postcolonial states strategically accepted aid from one or both sides, using it to fund development projects while trying to maintain some autonomy. This competition shaped development strategies, as countries chose between export-led growth, import substitution, or socialist planning based partly on their geopolitical alignments and the resources available from their patrons.

Question 13

1. External military and financial support from rival blocs often escalated local disputes into prolonged wars, as factions gained resources and legitimacy from patrons. (correct answer)
2. Cold War policies guaranteed immediate peace, because superpowers refused to supply weapons and required all African states to disband armies.
3. African conflicts were caused primarily by the Black Death, which destabilized states in the twentieth century through massive demographic collapse.
4. Superpower rivalry ended ethnic and regional tensions, since ideology replaced all local identities and eliminated competition for political power.
5. The Cold War had no impact on Africa, because both blocs agreed to avoid involvement and focused exclusively on Europe and North America.

Explanation: The correct answer is A, which explains how external military and financial support from rival blocs escalated local disputes in Africa into prolonged wars. During the Cold War, both superpowers and their allies (including Cuba and South Africa) provided weapons, military advisors, and funding to different factions in African conflicts. In Angola, for example, the MPLA received Soviet and Cuban support while UNITA was backed by the United States and South Africa, transforming a post-independence power struggle into a decades-long civil war. Similar patterns occurred in Ethiopia, Somalia, and Mozambique, where local conflicts over power, resources, or ethnic tensions became internationalized through superpower involvement. This external support not only prolonged conflicts but also increased their destructiveness and complicated peace negotiations.

Question 14

1. The collapse of all European empires by 1900, creating long-established independent states that rejected alliances as a matter of tradition.
2. The creation of rival Cold War blocs and pressure to choose sides, prompting postcolonial leaders to assert autonomy and resist superpower dominance. (correct answer)
3. A global agreement to abolish national sovereignty, which made alignment unnecessary because states no longer controlled foreign policy decisions.
4. The end of ideological politics worldwide, as both superpowers adopted identical economic systems and stopped competing for allies.
5. The spread of mercantilism and chartered companies, which encouraged states to remain neutral in order to protect colonial monopolies.

Explanation: The correct answer is B, which identifies the creation of rival Cold War blocs and pressure to choose sides as the primary catalyst for the Non-Aligned Movement. As the United States and Soviet Union divided the world into competing spheres of influence after 1945, newly independent states faced intense pressure to align with one superpower or the other. Leaders like Nehru, Nasser, and Tito recognized that such alignment could compromise their sovereignty and limit their policy options. The Non-Aligned Movement emerged as a third way, allowing states to maintain formal independence from both blocs while still engaging selectively with each for economic or security assistance. This movement represented an assertion of postcolonial autonomy against the bipolar structure of Cold War politics.

Question 15

1. Mutually assured destruction (MAD) encouraged caution, since a nuclear exchange would be catastrophic for both sides, promoting deterrence and crisis management. (correct answer)
2. Gunboat diplomacy replaced all negotiations, because nuclear weapons made compromise impossible and required constant direct warfare between superpowers.
3. Mercantilist competition drove nuclear policy, as states sought colonial monopolies and bullion rather than strategic deterrence or alliance politics.
4. The domino theory required nuclear first strikes, since both blocs believed only immediate nuclear war could prevent ideological spread in neighbors.
5. Collective security under the League of Nations prevented escalation, because it enforced disarmament and resolved crises through binding sanctions.

Explanation: The correct answer is A, which identifies Mutually Assured Destruction (MAD) as the concept that best explains how nuclear weapons influenced superpower behavior during the Cold War. MAD emerged from the recognition that both superpowers possessed sufficient nuclear arsenals to destroy each other completely, even after absorbing a first strike. This created a paradoxical stability: the very destructiveness of nuclear weapons made their use irrational, encouraging both sides to avoid direct confrontation and manage crises carefully. The Cuban Missile Crisis of 1962 demonstrated both the dangers of nuclear brinkmanship and the incentive for restraint, leading to the establishment of communication hotlines and arms control negotiations. MAD thus promoted a cautious approach to competition, channeling rivalry into proxy wars and ideological competition rather than direct military conflict.

Question 16

1. Widespread growth of security states and political repression, as leaders used anticommunism or anticapitalism to justify surveillance, purges, and censorship. (correct answer)
2. Immediate global democratization, as superpowers agreed to end ideological competition and encouraged multiparty elections in all allied states.
3. A sharp decline in state power, because Cold War ideology promoted decentralization and weakened national governments across both blocs.
4. Uniform expansion of labor unions independent of the state, since both superpowers prohibited government involvement in economic planning.
5. The end of propaganda campaigns, as radio and film were replaced by neutral international media controlled by the United Nations.

Explanation: The correct answer is A, which identifies the widespread growth of security states and political repression as a common political effect of the Cold War. Across different regions and ideological systems, governments used the Cold War context to justify expanding surveillance, conducting purges, and limiting civil liberties. In the United States, McCarthyism and the House Un-American Activities Committee investigated suspected communists, while in the Soviet Union and Eastern Europe, governments suppressed dissent as "bourgeois counter-revolution." Similar patterns appeared in Latin America, where military regimes claimed to protect against communist subversion, and in newly independent states where leaders labeled opposition as foreign-backed. This securitization of domestic politics, justified by Cold War tensions, became a global phenomenon that transcended ideological boundaries.

Question 17

1. The Marshall Plan, which offered substantial U.S. economic assistance to European states to spur recovery and reduce communist electoral appeal. (correct answer)
2. The Berlin Blockade, which restricted access to West Berlin in order to force Western Allies to abandon the city's occupation zones.
3. The Warsaw Pact, which created a Soviet-led military alliance to coordinate Eastern European defense and internal security policies.
4. Détente, which permanently ended ideological competition by dissolving NATO and removing U.S. troops from all European bases immediately after 1945.
5. The Non-Aligned Movement, which provided European colonies with independence in exchange for neutrality and membership in a single pan-European parliament.

Explanation: The Marshall Plan (Option A) was the most direct US policy aimed at strengthening Western Europe against Soviet influence through economic reconstruction. Announced in 1947, it provided over $12 billion in aid to rebuild European economies devastated by World War II. The plan's goals were both humanitarian and strategic: economic recovery would reduce the appeal of communist parties, create stable democracies, and build markets for American goods. By contrast, the Berlin Blockade (B) was a Soviet attempt to force Western withdrawal, while the Warsaw Pact (C) was a Soviet military alliance. The Marshall Plan's success in reviving Western European economies helped solidify the division of Europe and demonstrated the effectiveness of economic aid as a Cold War tool.

Question 18

1. The Non-Aligned Movement promoted independence from both superpower blocs, encouraging members to resist formal alliances while pursuing development assistance. (correct answer)
2. The Holy Alliance united European monarchs to suppress liberal revolutions, emphasizing dynastic legitimacy rather than decolonization or superpower rivalry.
3. The Hanseatic League coordinated medieval Baltic trade, focusing on merchant privileges and toll reductions instead of twentieth-century geopolitical alignment.
4. The Crusades created permanent military coalitions between Christian and Muslim states, establishing a long-lasting system of nonaligned diplomacy in Asia.
5. The League of Nations successfully prevented all wars after 1919, making Cold War alliance systems unnecessary for newly independent countries.

Explanation: The Non-Aligned Movement, formally established at the 1961 Belgrade Conference, represents the most significant Cold War-era attempt by newly independent states to chart an independent course between the superpowers. Answer (A) correctly identifies this movement, led by figures like Nehru (India), Nasser (Egypt), Tito (Yugoslavia), Sukarno (Indonesia), and Nkrumah (Ghana). These leaders rejected formal military alliances with either bloc while pursuing a pragmatic approach to development assistance - often accepting aid from both sides. The movement emphasized sovereignty, anti-imperialism, and South-South cooperation as alternatives to superpower domination. At Bandung (1955) and subsequent conferences, non-aligned states coordinated positions on decolonization, disarmament, and economic justice. While the movement couldn't prevent all members from being drawn into proxy conflicts, it provided diplomatic space for newly independent states to assert autonomy and critique both capitalist and communist models of development.

Question 19

1. European empires reestablished direct colonial rule over most of Africa, reversing independence movements and restoring pre-1914 political boundaries across the continent.
2. Newly independent states frequently became arenas for superpower-backed proxy wars, as in Vietnam or Angola, intensifying conflicts through external funding and arms. (correct answer)
3. Most decolonized countries adopted isolationism, rejecting foreign aid entirely and severing diplomatic ties with both superpowers to prevent ideological influence.
4. The Soviet Union dismantled its planned economy to join Western free-trade institutions, eliminating ideological competition and reducing military spending worldwide.
5. The United Nations permanently banned military alliances, forcing the dissolution of NATO and the Warsaw Pact and ending strategic competition in Europe.

Explanation: The Cold War profoundly shaped decolonization as newly independent states became battlegrounds for superpower influence. The correct answer (B) accurately describes how the US and USSR backed opposing sides in conflicts across Asia, Africa, and Latin America, providing weapons, advisors, and funding that transformed local disputes into prolonged proxy wars. Vietnam exemplifies this pattern, where a nationalist independence struggle became a decades-long conflict involving massive American military intervention against Soviet and Chinese-backed North Vietnam. Angola similarly saw Cuban troops and Soviet weapons supporting the MPLA government while the US and South Africa backed UNITA rebels. This external involvement often intensified and prolonged conflicts that might otherwise have been resolved more quickly. The Non-Aligned Movement emerged partly as a response to this dynamic, as leaders like Nehru, Nasser, and Sukarno sought to avoid formal alignment while still leveraging superpower competition for development aid.

Question 20

1. Containment, a policy aimed at limiting communist expansion through alliances, aid, and at times military intervention in strategic regions. (correct answer)
2. Mercantilism, a strategy of maximizing bullion by restricting colonial imports, used primarily to undermine Soviet influence in the twentieth century.
3. Appeasement, a doctrine of conceding territory to communist movements to reduce tensions and encourage rapid ideological convergence worldwide.
4. Isolationism, a commitment to withdraw from global alliances, dismantle overseas bases, and avoid diplomatic involvement in any foreign conflict.
5. Collective security under the League of Nations, which coordinated sanctions against aggressors and prevented Cold War conflicts from occurring at all.

Explanation: Containment (Option A) was the foundational US strategy throughout the Cold War, aimed at preventing the spread of communism beyond where it already existed. Articulated by diplomat George Kennan in 1947, containment shaped US foreign policy for decades. The strategy involved creating alliances like NATO, providing economic aid through programs like the Marshall Plan, and when deemed necessary, military intervention as in Korea and Vietnam. Containment assumed that communism would eventually collapse from internal contradictions if prevented from expanding. This doctrine justified US involvement worldwide and transformed local conflicts into Cold War confrontations. While containment avoided direct war with the Soviet Union, it led to numerous proxy conflicts and shaped the global order for nearly half a century.