The basis of European Union began with the signing of—

1. Introduction to Supranationalism in IR (basic)

To understand the European Union, we must first master the concept of supranationalism. In traditional International Relations (IR), the state is seen as the ultimate authority—this is called sovereignty. However, as the world became more interconnected, the "erosion of state capacity" led countries to look for new ways to manage issues like trade, security, and environment Contemporary World Politics, Globalisation, p.103. While most international bodies (like the UN or IMF) are intergovernmental—meaning states cooperate but keep their full power—a supranational organization is one where member states voluntarily delegate or "pool" their decision-making power to a central authority.

Think of it as the difference between a neighborhood watch and a local government. In a neighborhood watch (intergovernmental), you agree to help your neighbors, but you still make every decision for your own house. In a supranational setup, you give the central authority the right to make laws that apply to your house, even if you personally disagreed with that specific law. This is a sophisticated form of power-sharing. As we see in political systems like Belgium, sharing power can actually make a collective unit more stable and powerful than if each part acted alone Democratic Politics-II, Power-sharing, p.5.

The table below highlights the key differences between these two ways of organizing countries:

Feature	Intergovernmentalism	Supranationalism
Decision Authority	States retain a veto; usually requires unanimity.	Decisions can be made by majority; binding on all.
Sovereignty	States keep full sovereign control.	States "pool" or cede parts of their sovereignty.
Example	The United Nations (UN) or SAARC.	The European Union (EU).

In the post-Cold War era, as the world moved away from a simple unipolar system dominated by one superpower, regional groups of countries became "important players in the international system" Contemporary World Politics, The End of Bipolarity, p.7. The European Union is the most advanced example of this, where nations decided that they are stronger together as a supranational block than as individual competing states.

Sources: Contemporary World Politics, Globalisation, p.103; Democratic Politics-II, Power-sharing, p.5; Contemporary World Politics, The End of Bipolarity, p.7

2. Post-War Europe and the Schuman Declaration (basic)

After the devastation of World War II, Europe faced two massive challenges: economic reconstruction and the desperate need to prevent another catastrophic conflict. The traditional rivalry between France and Germany was the greatest threat to peace. To solve this, French Foreign Minister Robert Schuman realized that instead of just signing peace treaties, Europe needed to physically link the industries required for war. On 9 May 1950, he presented the Schuman Plan, which proposed placing the production of coal and steel—the two most critical raw materials for armaments—under a common supranational structure called the High Authority History, class XII (Tamilnadu state board 2024 ed.), The World after World War II, p.257. This move was revolutionary because it required nations to surrender a portion of their sovereignty to an outside body. By pooling these resources, any secret mobilization for war would become physically impossible. This vision was realized on 18 April 1951, when six countries—France, West Germany, Italy, Belgium, the Netherlands, and Luxembourg—signed the Treaty of Paris to create the European Coal and Steel Community (ECSC) Contemporary World Politics (NCERT 2025 ed.), Contemporary Centres of Power, p.18. This community removed all trade duties on these materials among the members, marking the very first concrete step toward European integration. While the "Inner Six" moved forward, some nations remained hesitant. Great Britain, for instance, refused to join the ECSC at this stage because it was unwilling to hand over control of its national industries to an international authority History, class XII (Tamilnadu state board 2024 ed.), The World after World War II, p.257. This created a divide between those seeking deep integration and those favoring national independence, a theme that would persist for decades in European politics.

Sources: History, class XII (Tamilnadu state board 2024 ed.), The World after World War II, p.257; Contemporary World Politics, Textbook in political science for Class XII (NCERT 2025 ed.), Contemporary Centres of Power, p.18

3. The European Economic Community (EEC) Era (intermediate)

After the success of the European Coal and Steel Community (ECSC), European leaders realized that economic cooperation shouldn't be limited to just two commodities. In March 1957, the same six founding nations (France, West Germany, Italy, Belgium, the Netherlands, and Luxembourg) signed the Treaties of Rome. This established two critical bodies: Euratom (for nuclear energy cooperation) and, most importantly, the European Economic Community (EEC) Contemporary World Politics, NCERT Class XII, p.18. The EEC was designed to create a "Common Market," moving beyond mere diplomacy toward deep economic interdependence.

The EEC era was defined by the pursuit of the "Four Freedoms": the free movement of goods, services, capital, and labor across national borders History, Class XII (Tamilnadu State Board), p.257. To achieve this, the member states worked to eliminate internal tariffs and established a Common External Tariff toward the rest of the world. They also launched the Common Agricultural Policy (CAP) to modernize farming and ensure food security. However, not everyone was on board initially. Britain, wary of losing sovereignty, organized a rival group called the European Free Trade Association (EFTA) in 1960 with six other nations History, Class XII (Tamilnadu State Board), p.257.

Feature	European Economic Community (EEC)	European Free Trade Association (EFTA)
Core Vision	Deep integration, common external tariffs, and shared social policies.	Loose trade cooperation; members kept their own tariffs for non-members.
Leading Power	France and West Germany	United Kingdom

The 1970s and 80s saw the EEC's "magnetic pull" increase. The UK, after initially being blocked by French President Charles de Gaulle, finally joined in 1973 along with Denmark and Ireland Contemporary World Politics, NCERT Class XII, p.18. This era also saw the birth of the Schengen Agreement (1985), which aimed to abolish border checks, signaling that the EEC was no longer just about trade—it was beginning to touch the daily lives of citizens. By the late 1980s, the community had expanded to include Mediterranean nations like Greece, Spain, and Portugal, setting the stage for a transition from a purely economic community to a political union.

Sources: Contemporary World Politics, NCERT Class XII, Contemporary Centres of Power, p.18; History, Class XII (Tamilnadu State Board), The World after World War II, p.257

4. Comparative Regionalism: EU vs ASEAN (exam-level)

Regionalism is a powerful force in global politics, where countries in a geographical area unite to foster economic growth, protect indigenous cultures, or increase their collective political influence Geography of India, India–Political Aspects, p.19. While both the European Union (EU) and ASEAN are successful regional blocs, they represent two fundamentally different philosophies of integration. The EU is often described as a supranational entity, where member states have surrendered parts of their national sovereignty to central institutions like the European Commission and Parliament. In contrast, ASEAN is strictly intergovernmental, prioritizing the national sovereignty of its members above all else Contemporary World Politics, Contemporary Centres of Power, p.20.

The hallmark of Southeast Asian regionalism is the 'ASEAN Way'. Unlike the EU, which relies on formal treaties, legalistic procedures, and a common currency, ASEAN functions through a style of interaction that is informal, non-confrontationist, and cooperative Contemporary World Politics, Contemporary Centres of Power, p.20. While the EU moved from an economic community to a political union with a common foreign policy, ASEAN initially focused on economic and social cooperation to curb the influence of global powers and speed up intra-regional trade Fundamentals of Human Geography, International Trade, p.74.

Despite these differences, ASEAN has gradually moved toward a more structured framework. In 2003, it followed the EU’s lead by establishing the ASEAN Community, which rests on three pillars: Security, Economic, and Socio-Cultural Contemporary World Politics, Contemporary Centres of Power, p.20. However, even with these pillars, the core objective remains the creation of a Free Trade Area (FTA) and a common production base, rather than the creation of a 'United States of Southeast Asia' Contemporary World Politics, Contemporary Centres of Power, p.21.

Feature	European Union (EU)	ASEAN
Institutional Nature	Supranational (Centralized power)	Intergovernmental (State-led)
Decision Making	Formal, legalistic, often by majority	The 'ASEAN Way': Informal, consensus-based
Sovereignty	Pooled/Shared sovereignty	Strict respect for national sovereignty
Economic Scope	Single Market & Common Currency (Euro)	Free Trade Area (FTA) & Production Base

Sources: Contemporary World Politics, Contemporary Centres of Power, p.20-21; Geography of India, India–Political Aspects, p.19; Fundamentals of Human Geography, International Trade, p.74

5. The Eurozone and Single Market Dynamics (intermediate)

The evolution of the European project reached a watershed moment in the late 20th century, shifting from a primarily economic cooperation to a deep-seated political and monetary union. At the heart of this transition is the Single Market, which is characterized by the 'Four Freedoms': the free movement of goods, services, capital, and people. While earlier agreements like the Treaty of Rome focused on lowering tariffs, the Single European Act (1987) was the catalyst that accelerated this integration by streamlining decision-making through 'multiple votes' based on population, ensuring that legislation could be passed more efficiently to dismantle internal borders History, Class XII (Tamilnadu state board 2024 ed.), The World after World War II, p.257. However, the definitive birth of the modern European Union (EU) occurred with the Maastricht Treaty (signed in 1992, effective in 1993). This treaty did not just expand trade; it established a three-pillar structure: the European Communities, a Common Foreign and Security Policy (CFSP), and cooperation in Justice and Home Affairs Contemporary World Politics, Class XII (NCERT 2025 ed.), Contemporary Centres of Power, p.16. By integrating these political dimensions, the EU moved beyond being a mere trade bloc to becoming a global political actor, laying the groundwork for a shared identity among its member states. The most visible symbol of this integration is the Eurozone. The Maastricht Treaty paved the way for the creation of a single currency—the Euro—to eliminate exchange rate risks and transaction costs within the market History, Class XII (Tamilnadu state board 2024 ed.), The World after World War II, p.258. It is important to distinguish between the two: while the Single Market includes all EU members (and some non-EU members), the Eurozone refers specifically to those EU countries that have fully adopted the Euro as their sole legal tender. This 'multi-speed Europe' allows for deep economic synchronization while maintaining distinct political layers.

Sources: History, Class XII (Tamilnadu state board 2024 ed.), The World after World War II, p.257-258; Contemporary World Politics, Class XII (NCERT 2025 ed.), Contemporary Centres of Power, p.16

6. Modern EU Structure: From Maastricht to Lisbon (exam-level)

To understand the modern European Union (EU), we must look beyond its origins as a coal and steel alliance. The real transformation happened in the early 1990s, when the project shifted from a purely economic agreement to a full-fledged political entity. The watershed moment was the Maastricht Treaty (signed in 1992, effective in 1993), which officially established the European Union History, class XII (Tamilnadu state board 2024 ed.), The World after World War II, p.258. This wasn't just a name change; it introduced a unique "Three Pillars" structure that allowed member states to cooperate on sensitive issues like Common Foreign and Security Policy (CFSP) and Justice and Home Affairs, while also paving the way for the single currency, the Euro Contemporary World Politics, Textbook in political science for Class XII (NCERT 2025 ed.), Contemporary Centres of Power, p.18.

Following Maastricht, the EU underwent a massive expansion, particularly in 2004 when ten new members—mostly from Eastern Europe—joined the fold Contemporary World Politics, Textbook in political science for Class XII (NCERT 2025 ed.), Contemporary Centres of Power, p.18. However, this rapid growth created a "bottleneck" in decision-making. An attempt to draft a formal European Constitution failed in 2003 due to fears of losing national sovereignty, famously depicted by cartoonists as a "Titanic" hitting the icebergs of public skepticism Contemporary World Politics, Textbook in political science for Class XII (NCERT 2025 ed.), Contemporary Centres of Power, p.19. This led to the Lisbon Treaty (2009), which replaced the failed constitution and modernized the EU’s internal rules to make a 27-member bloc more manageable.

It is important to note that integration hasn't always been uniform. Countries like Denmark and Sweden famously resisted the Euro, and Britain maintained a distant relationship with the common market long before the 2017 Brexit vote Contemporary World Politics, Textbook in political science for Class XII (NCERT 2025 ed.), Contemporary Centres of Power, p.19. This "multi-speed Europe" remains a core challenge in modern EU governance today.

Feature	Maastricht Treaty (1992)	Lisbon Treaty (2009)
Primary Goal	Establishment of the EU and Economic/Monetary Union.	Modernizing and streamlining institutions for a larger bloc.
Structure	Created the "Three Pillars" (Economic, Foreign Policy, Justice).	Abolished the pillar system for a more unified legal personality.

Sources: History, class XII (Tamilnadu state board 2024 ed.), The World after World War II, p.258; Contemporary World Politics, Textbook in political science for Class XII (NCERT 2025 ed.), Contemporary Centres of Power, p.18; Contemporary World Politics, Textbook in political science for Class XII (NCERT 2025 ed.), Contemporary Centres of Power, p.19

7. Solving the Original PYQ (exam-level)

In your recent modules, you traced the evolution of European integration from post-WWII reconstruction to the creation of a single market. This question tests your ability to pinpoint the exact legal transformation where economic cooperation turned into a formal political entity. While the process was incremental, the Maastricht Treaty (1992) serves as the formal foundation because it officially renamed the 'European Economic Community' to the European Union and introduced the three-pillar structure involving common foreign policy and judicial cooperation.

To arrive at the correct answer, you must distinguish between the precursors and the entity itself. The Treaty of Paris (1951) and the Treaty of Rome (1957) are classic UPSC traps; they established the ECSC and EEC respectively, focusing primarily on sectoral and economic integration. These were the building blocks, but they did not create the 'Union' as a political concept. Similarly, the Treaty of Lisbon (2007) was a significant reform measure to modernize the EU's structure, but it did not 'begin' the Union; it merely amended what already existed.

As emphasized in NCERT Contemporary World Politics, the Maastricht Treaty is the definitive answer because it transitioned the project from a purely economic community into a political union. When UPSC asks for the 'basis' of the Union, they are looking for the specific moment of formal institutionalization. Therefore, (A) Maastricht Treaty is the only choice that represents the legal birth of the European Union as a sovereign-like entity.