The European Union

From postwar reconstruction to political and economic supranational integration: how Europe's most ambitious project reshaped the continent.

AP European History

What Is the European Union?

The European Union is a political and economic union of 27 member states located primarily in Europe. It operates through a system of supranational institutions and intergovernmental decisions negotiated by member states.

Supranational

Authority above the nation-state: EU law can override domestic law in certain areas.

Intergovernmental

Cooperation between sovereign states that retain veto power on key decisions.

Why Was It Created?

After two devastating world wars, European leaders sought a framework that would make conflict between member states materially impossible. Economic interdependence was the chosen path to lasting peace.

1

Prevent war. Binding France and Germany economically would remove the incentive for conflict.

2

Rebuild Europe. Pooling resources (coal and steel) accelerated postwar recovery.

3

Counter Soviet influence. A strong, unified Western Europe was a Cold War strategic asset.

Key Founders and Ideas

Jean Monnet

"Father of Europe." Architect of the Schuman Plan and the idea of functional integration.

Robert Schuman

French Foreign Minister who proposed pooling French and German coal and steel production in 1950.

Konrad Adenauer

West German Chancellor who embraced Western integration as a path to sovereignty and legitimacy.

Timeline of Integration

1951

ECSC Founded

Treaty of Paris: France, Germany, Italy, Belgium, Netherlands, Luxembourg pool coal and steel.

1957

Treaty of Rome

Creates the EEC (European Economic Community) and Euratom. Establishes a common market.

1986

Single European Act

Commits to completing the single market by 1992. Expands qualified majority voting.

1992

Maastricht Treaty

Formally creates the EU. Introduces EU citizenship, the three-pillar structure, and plans for a single currency.

1999

Euro Introduced

Single currency launches for electronic transactions; coins and notes follow in 2002.

2007

Treaty of Lisbon

Reforms institutions, creates the permanent European Council president and High Representative for foreign affairs.

Core Institutions

Supranational vs Intergovernmental

	Supranational	Intergovernmental
Decision-making	Majority voting; states can be outvoted	Unanimity required; each state has veto
Sovereignty	Pooled: states delegate authority	Retained: states cooperate voluntarily
EU Examples	Commission, Parliament, Court	European Council, foreign policy
Law	EU law has direct effect	Decisions require national ratification

The Four Freedoms

The Single Market is built on four fundamental freedoms that eliminate barriers between member states:

Goods

No tariffs or quotas on trade between EU members.

Services

Professionals can offer services across borders without re-licensing.

Capital

Money and investments flow freely between member states.

People

Citizens can live, work, and study in any member state.

The Euro and Monetary Union

The Maastricht Treaty (1992) established criteria for adopting the euro. The European Central Bank (ECB) manages monetary policy for the 20 eurozone members.

1

Convergence criteria: Limits on inflation, debt, budget deficits, interest rates, and exchange rate stability.

2

Single monetary policy: ECB sets interest rates for all eurozone countries. Individual states lose this tool.

3

No unified fiscal policy: Taxation and spending remain national, creating a structural tension.

Waves of Enlargement

How Integration Works: Spillover

Neofunctionalism is the theory that integration in one sector creates pressure to integrate in related sectors: a process called spillover.

How to Analyze EU Events

When an AP exam question asks you to evaluate an EU development, follow this framework:

1

Identify the treaty or event. What was signed, and what powers did it create or transfer?

2

Determine the context. Was this driven by economic crisis, Cold War pressure, democratic expansion, or internal momentum?

3

Classify the approach. Is it supranational (pooling sovereignty) or intergovernmental (preserving state control)?

4

Assess the consequences. Did it deepen integration (spillover), provoke backlash (Euroscepticism), or both?

5

Connect to broader themes. Link to nationalism, globalization, democratic deficit, or postwar reconciliation.

Example: The Maastricht Treaty (1992)

Let's apply our framework to the treaty that formally created the European Union.

1

Event: Signed in 1992. Created EU citizenship, the three-pillar structure, and the path to the euro.

2

Context: End of Cold War; German reunification (1990) made deeper integration both possible and urgent.

3

Approach: Mixed: Pillar 1 (EC) was supranational; Pillars 2-3 (foreign policy, justice) were intergovernmental.

4

Consequences: Led to the euro (1999) but also Euroscepticism: Denmark initially voted "no" in a referendum.

Example: 2004 Enlargement

The largest single expansion in EU history: 10 new members, 8 from the former Eastern Bloc.

Context

Post-Cold War: former communist states sought democratic legitimacy and economic stability through EU membership.

Requirements

Copenhagen Criteria (1993): stable democracy, functioning market economy, ability to adopt EU law (acquis).

Example: Brexit (2016-2020)

The United Kingdom's departure from the EU was the first time a member state invoked Article 50 of the Lisbon Treaty.

1

Context: Rising Euroscepticism, immigration debates, sovereignty concerns, and the 2016 referendum (51.9% Leave).

2

Approach: Intergovernmental at its core: a sovereign state exercised its right to withdraw.

3

Consequences: Disrupted trade, raised the Irish border question, and emboldened Eurosceptic movements across Europe.

Common Mistakes

✕ EU = Europe

Not all European countries are EU members. Switzerland, Norway, and (now) the UK are not in the EU.

✕ All EU = Euro

Not all EU members use the euro. Poland, Sweden, and others retain their own currencies.

✕ EU = Federal State

The EU is not a country. Member states retain sovereignty over taxation, defense, and foreign policy.

Key Treaties at a Glance

Treaty	Year	Key Innovation	Significance
Treaty of Paris	1951	ECSC	First supranational body
Treaty of Rome	1957	EEC, common market	Four freedoms established
Single European Act	1986	Single market deadline	Majority voting expanded
Maastricht Treaty	1992	EU, euro path, citizenship	Political union begins
Treaty of Lisbon	2007	Permanent Council president	Institutional reform

Question 1 of 5

The Schuman Declaration of 1950 proposed pooling which resources under a common authority?

The Schuman Declaration specifically targeted coal and steel: the raw materials of war. By placing them under a shared High Authority, Schuman and Monnet aimed to make Franco-German conflict materially impossible.

Question 2 of 5

Which treaty formally created the European Union and established the path toward a single currency?

The Maastricht Treaty (1992) renamed the community the "European Union," introduced EU citizenship, and set convergence criteria for adopting the euro. The Treaty of Rome created the EEC, not the EU itself.

Question 3 of 5

Historian A: "The European project has always been driven by elites: technocrats in Brussels designing institutions without meaningful democratic input. The 'democratic deficit' is not a flaw but a feature of how integration has actually worked."

Historian B: "While early integration was technocratic, the introduction of direct elections to the European Parliament in 1979 and the expansion of co-decision powers show a sustained effort to democratize EU governance."

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The fundamental point of disagreement between the two historians concerns whether:

Both historians agree that early integration was elite-driven. They disagree about whether the EU has successfully democratized since then. Historian A says the deficit persists; Historian B points to reforms that have expanded democratic accountability.

Question 4 of 5

The theory of neofunctionalism predicts that integration in one economic sector will:

Spillover is the core mechanism of neofunctionalism: integrating coal and steel created demands for a common market, which created demands for a common currency. This does not mean a federal state is inevitable (choice C overstates the theory).

Question 5 of 5

Which of the following best explains why the 2004 enlargement was historically significant?

The 2004 enlargement brought in 8 former communist states (plus Malta and Cyprus), reuniting Europe after decades of Cold War division. New members were required to meet the Copenhagen Criteria but did not immediately adopt the euro.