A History of the European Union

• Introduction
• Chapter 1 The Post-War Dream: The Schuman Declaration and the Birth of the European Coal and Steel Community.
• Chapter 2 From Coal and Steel to a Common Market: The Treaties of Rome.
• Chapter 3 The First Enlargement: The United Kingdom, Ireland, and Denmark Join the Club.
• Chapter 4 The 1970s: Economic Challenges and the European Monetary System.
• Chapter 5 A Southern Expansion: Greece, Spain, and Portugal Join the Community.
• Chapter 6 The Single European Act: Towards a Deeper Integration.
• Chapter 7 The Fall of the Berlin Wall and the Reunification of Germany.
• Chapter 8 The Maastricht Treaty and the Creation of the European Union.
• Chapter 9 A New Wave of Members: Austria, Finland, and Sweden.
• Chapter 10 The Treaty of Amsterdam: Consolidating and Building Upon Maastricht.
• Chapter 11 The Introduction of the Euro: A New Currency for Europe.
• Chapter 12 The Treaty of Nice: Preparing for the Great Enlargement.
• Chapter 13 The "Big Bang" Enlargement: Welcoming Ten New Member States.
• Chapter 14 The Constitutional Treaty and its Rejection.
• Chapter 15 Further Expansion: Romania and Bulgaria Join the Union.
• Chapter 16 The Treaty of Lisbon: Reforming the Union's Institutions.
• Chapter 17 The Global Financial Crisis and the Eurozone Debt Crisis.
• Chapter 18 A Decade of Challenges: The Migrant Crisis and Rise of Populism.
• Chapter 19 Croatia Joins the Family: The 28th Member State.
• Chapter 20 Brexit: The United Kingdom's Departure from the European Union.
• Chapter 21 The COVID-19 Pandemic: A Union-Wide Response.
• Chapter 22 The Russian Invasion of Ukraine and the EU's Geopolitical Awakening.
• Chapter 23 The Green Deal and the Digital Decade: Charting the Future.
• Chapter 24 Enlargement on the Horizon: The Western Balkans, Ukraine, and Moldova.
• Chapter 25 The European Union Today and the Challenges Ahead.
• Glossary of Terms

It is an entity that defies easy definition. It is a political and economic union of twenty-seven member states, a colossal trading bloc, and a global regulatory power. It has its own flag, an anthem, a currency used by twenty-one of its members, and a motto: "United in Diversity." Yet, it is not a country, not a federation in the traditional sense, nor merely an international organization. The European Union is often described by the Latin phrase sui generis—a thing of its own kind—and for good reason. It is the result of a seventy-year experiment in pooling sovereignty, a project born from the most catastrophic conflict in human history with the audacious goal of making war on the European continent "not merely unthinkable, but materially impossible." This book tells the story of that experiment, a narrative of grand ambitions, painstaking negotiations, unexpected crises, and relentless, often messy, evolution.

To understand the European Union, one must first understand the world that created it. The first half of the twentieth century saw Europe tear itself apart twice in devastating wars that left tens of millions dead, economies in ruins, and cities reduced to rubble. The end of the Second World War in 1945 did not bring a simple return to peace; it brought a new kind of dread. The continent was scarred, impoverished, and ideologically divided, standing at the precipice of a new global standoff between the United States and the Soviet Union—the Cold War. For centuries, the "age-old opposition of France and Germany" had been the engine of European conflict. After 1945, the question of how to rebuild and integrate a defeated West Germany without resurrecting its military threat became the central geopolitical problem for Western Europe.

It was in this atmosphere of profound anxiety and cautious hope that the idea of European integration took root. Visionary leaders—men like France's Robert Schuman and Jean Monnet, Germany's Konrad Adenauer, and Italy's Alcide De Gasperi—argued that the old system of rival nation-states was a recipe for perpetual conflict. They believed that the only way to secure a lasting peace was to bind the nations of Europe together so tightly, beginning with their economic foundations, that their interests would become inextricably linked. This was not a call for a sudden, revolutionary transformation into a United States of Europe. Instead, as the Schuman Declaration of May 9, 1950, famously stated, "Europe will not be made all at once, or according to a single plan. It will be built through concrete achievements which first create a de facto solidarity."

The first of these concrete achievements, and the subject of our first chapter, was the European Coal and Steel Community (ECSC), established by the Treaty of Paris in 1951. The six founding members—France, West Germany, Italy, Belgium, the Netherlands, and Luxembourg—agreed to place their production of coal and steel, the essential materials for warfare, under the control of a common High Authority. It was a masterstroke of pragmatic idealism. By pooling these specific, vital resources, the founders made it materially difficult for France and Germany to rearm against each other and laid the first stone in the foundation of a new European structure. For the first time, participating states voluntarily transferred a piece of their national sovereignty to a supranational organization.

From this modest, industry-specific beginning, the project of European integration has lurched forward, expanding in both scope and membership. The journey has been marked by a series of foundational treaties, each one representing a hard-won compromise and a new stage of development. The Treaties of Rome in 1957 created the European Economic Community (EEC), or "Common Market," which established a customs union and the goal of allowing goods, services, capital, and people to move freely across borders. This marked the shift from a focus on heavy industry to the creation of a broad-based economic community. Later, the 1965 Merger Treaty combined the executive bodies of the ECSC, the EEC, and the European Atomic Energy Community (Euratom) into a single institutional structure, known collectively as the European Communities.

The story of the EU is also a story of constant growth. The original "Inner Six" were joined over the decades by successive waves of enlargement, a process that has often been as much about geopolitics as economics. From the first enlargement in the 1970s that brought in the United Kingdom, Ireland, and Denmark, to the southern expansion in the 1980s that embraced the newly democratic nations of Greece, Spain, and Portugal, the Community grew. The fall of the Berlin Wall in 1989 was a pivotal moment, paving the way for the reunification of Germany and opening the door to the "big bang" enlargement of 2004, which welcomed ten countries, many from the former Eastern Bloc. Each expansion brought new cultures, new economic realities, and new political priorities, enriching the Union while also increasing its complexity and potential for disagreement.

This relentless process of "widening" has always been accompanied by a parallel drive for "deepening"—the strengthening of the bonds between existing members. This dual dynamic is a central theme of the EU's history. The 1986 Single European Act revitalized the push for a genuine single market. This was followed by the landmark Maastricht Treaty in 1992, which officially created the "European Union" as we know it today. Maastricht was a quantum leap in integration, establishing the "three-pillar" structure that added common foreign and security policy and cooperation in justice and home affairs to the existing economic community. Most famously, it laid the groundwork for the most ambitious project of all: a single currency, the euro, which would enter circulation a decade later.

Subsequent treaties, from Amsterdam and Nice to the ultimately rejected Constitutional Treaty and its successor, the Treaty of Lisbon, have continued this process of institutional tinkering. They have sought to make the Union more efficient, more democratic, and more capable of acting on the world stage—all while balancing the competing interests of its ever-growing membership. The result is a complex and unique institutional framework. There is the European Commission, the EU's executive arm, which proposes legislation and represents the common interest of the Union. The Council of the European Union, where ministers from the member states' governments meet to pass laws, sits alongside the European Council, which comprises the heads of state or government and sets the overall political direction. The directly elected European Parliament represents the citizens and shares legislative power with the Council. And overseeing it all is the Court of Justice of the European Union, which ensures that EU law is interpreted and applied the same way in every member country.

This journey has been anything but smooth. The history of the European Union is a history of crises. From the "empty chair" crisis in the 1960s, when French President Charles de Gaulle boycotted the institutions, to the economic turmoil of the 1970s and the fierce budget debates of the 1980s, the project has often seemed on the verge of collapse. In the 21st century, the challenges have come faster and with greater intensity. The global financial crisis of 2008 morphed into a sovereign debt crisis that threatened the very existence of the euro. This was followed by a massive influx of refugees and migrants that tested the Union's internal solidarity and external borders, the rise of nationalist and populist movements deeply skeptical of the European project, and the unprecedented shock of Brexit, the departure of the United Kingdom. More recently, the COVID-19 pandemic and Russia's full-scale invasion of Ukraine have forced the EU to act with a speed and unity that many thought impossible.

Yet, as one of the EU's founding fathers, Jean Monnet, once observed, "Europe will be forged in crises, and will be the sum of the solutions adopted for those crises." Time and again, the EU has responded to challenges not by disintegrating, but by integrating further. The Eurozone crisis led to the creation of new financial backstops and a banking union. The pandemic gave rise to a common vaccine procurement strategy and a massive joint recovery fund. The war in Ukraine has spurred a newfound sense of geopolitical purpose and a push for greater strategic autonomy in defense and energy. This pattern of responding to emergencies with "more Europe" is a defining feature of its history.

This book will navigate this complex and often contradictory history chronologically. It will tell the stories behind the treaties, the triumphs, and the tribulations. It will examine the key figures, the political bargains, and the economic forces that have shaped the Union at every stage. It will chart the evolution from a six-member club focused on coal and steel to a 27-nation entity grappling with climate change, digital transformation, and its role as a global power. It is a story with no clear endpoint, an ongoing process of creation and adaptation. It is the story of how, from the ashes of war, a new and entirely unprecedented form of political and economic life has taken shape on the European continent. Our story begins, as it must, with the post-war dream of a lasting peace.

In the spring of 1950, Europe was a continent suspended between a traumatic past and an uncertain future. Only five years had passed since the guns fell silent, yet the physical and psychological scars of the Second World War were everywhere. Cities remained patchworks of rubble and reconstruction, economies were struggling to their feet, and millions of people were still displaced. The war had not only destroyed infrastructure; it had shattered an entire political order, leaving a power vacuum swiftly filled by two new global superpowers, the United States and the Soviet Union. A new, ideological conflict—the Cold War—had descended, dividing the continent with what Winston Churchill had famously termed an "Iron Curtain."

For Western Europe, this new reality was profoundly unsettling. The immediate threat was twofold: the internal appeal of communism in countries like France and Italy, fueled by post-war deprivation, and the external threat of Soviet expansionism. Compounding this anxiety was a dilemma that had plagued the continent for nearly a century: the "German problem." A productive, economically stable West Germany was essential for the recovery of the entire region. Yet, the prospect of a revived Germany, with its immense industrial potential, struck fear into the hearts of its neighbors, particularly France, which had been invaded by Germany three times in the preceding seventy-five years. How could Germany be rebuilt without being rearmed? How could its economic engine be harnessed for the good of Europe without once again becoming a threat to it?

American aid, through the ambitious European Recovery Program, better known as the Marshall Plan, was instrumental in kick-starting economic recovery. Beginning in 1948, the United States transferred billions of dollars to Western European economies, helping to rebuild industries, control inflation, and restore trade. Crucially, the plan came with conditions; it pushed European states to cooperate, to lower trade barriers, and to think of their economic recovery as a shared, continental project. This American-led initiative was a powerful catalyst for integration, but the political architecture for a new Europe had to be designed and built by Europeans themselves.

The first attempts at political cooperation were born from this spirit of cautious idealism. In May 1948, hundreds of delegates from across the political spectrum gathered in the Netherlands for the Hague Congress to discuss new forms of European cooperation. This groundswell of pro-European sentiment led to a tangible outcome: the creation of the Council of Europe on May 5, 1949. With its headquarters in Strasbourg, a city that had so often been a symbol of Franco-German conflict, the Council's aim was to promote democracy and protect human rights. It was a noble and important step, establishing a forum for intergovernmental dialogue. Yet its powers were limited. The Council of Europe was a body where national governments conferred, but it could not compel its members to act. It was a talking shop, not a powerhouse. For some, this was not nearly enough to solve the deep-seated problems facing the continent.

Into this environment stepped a man who was neither a charismatic politician nor a public figure. Jean Monnet was a French civil servant and political economist, a pragmatist who had spent his life working behind the scenes. Born in the Cognac region of France into a family of brandy merchants, he was a connector, a planner, and an internationalist by nature. During both world wars, he had played key roles in coordinating allied production and supply chains. His experiences had left him with a profound conviction: the system of sovereign nation-states, left to their own devices, was inherently unstable and a breeding ground for conflict. Simple intergovernmental cooperation, which left national sovereignty untouched, was bound to fail when confronted with serious national interests. He believed that the only path to lasting peace was to make European nations so interdependent that war between them would become a practical impossibility. As he declared during the war, "There will be no peace in Europe, if the states are reconstituted on the basis of national sovereignty... The countries of Europe are too small to guarantee their peoples the necessary prosperity and social development."

After the war, Monnet was in charge of France's own modernization plan, but he saw a bigger picture. The ongoing friction between France and West Germany over control of vital coal and steel resources was a dangerous reminder of old patterns. France was desperate for German coal from the Ruhr region to fuel its steel mills, and tensions were simmering. Monnet saw an opportunity to use this very point of contention as the starting point for a radical new idea. In the spring of 1950, he gathered a small team and, in secret, drafted a revolutionary proposal. The idea was not to manage the industries, nor to create a cartel, but to place the entire Franco-German production of coal and steel under a common, independent, High Authority. Other European countries would be welcome to join. This was the masterstroke: for the first time, nations would be asked to transfer a portion of their sovereignty to a new, supranational institution.

Monnet knew his idea needed a political champion, and he found the perfect partner in Robert Schuman, the French Foreign Minister. Schuman's life story embodied the complex, often tragic, history of the Franco-German borderlands. Born a German citizen in Luxembourg in 1886, he became French only after Alsace-Lorraine was returned to France in 1919. A devout Christian Democrat, he had been active in the French Resistance during the war. He understood, with a personal conviction, that a new relationship with Germany was the absolute prerequisite for a peaceful Europe. When Monnet presented his plan, Schuman embraced it as the "creative effort" that the perilous times demanded.

The timing was critical. Schuman was due to meet with his British and American counterparts, and he needed a bold French initiative to present on the German question. After securing the last-minute approval of the French cabinet, he decided to make the plan public. First, however, he needed to know if the other key player would agree. A secret message was dispatched to Konrad Adenauer, the first Chancellor of the newly-formed Federal Republic of Germany. Adenauer, a stern and pragmatic conservative, had one overarching goal: to anchor West Germany firmly in the West, regain its sovereignty, and achieve reconciliation with its former enemies. The Schuman Plan offered him a path to achieve all of this, allowing Germany to re-join the family of European nations as an equal partner, not a vanquished foe. His response was immediate and unequivocal: "That's our breakthrough."

On the afternoon of May 9, 1950, in the Salon de l'Horloge at the Quai d'Orsay in Paris, Robert Schuman delivered the declaration that would change the course of European history. The proposal, he began, might seem revolutionary, but it was a direct response to the dangers at hand. "World peace cannot be safeguarded without the making of creative efforts proportionate to the dangers which threaten it," he stated. The core of the problem, he argued, was the "age-old opposition of France and Germany." The plan aimed to make war between the two nations "not merely unthinkable, but materially impossible."

The method would be pragmatic and incremental. Schuman famously declared, "Europe will not be made all at once, or according to a single plan. It will be built through concrete achievements which first create a de facto solidarity." The first concrete achievement would be the pooling of coal and steel. "The solidarity in production thus established will make it plain that any war between France and Germany becomes not merely unthinkable, but materially impossible." The management of these resources would be entrusted to a common High Authority, "whose decisions will bind France, Germany and other member countries." This was the revolutionary kernel: the creation of a supranational body whose authority would supersede that of national governments in a specific, limited field.

The announcement caught the world by surprise. In Germany and Italy, and across the smaller Benelux nations (Belgium, the Netherlands, and Luxembourg), the reaction was overwhelmingly positive. Here was a chance to move beyond the cycle of war and build a new kind of partnership. The United States also gave its enthusiastic backing. The British, however, were skeptical. The Labour government of Clement Attlee was wary of any project that might compromise British sovereignty or its economic ties with the Commonwealth. The commitment to a supranational authority was a bridge too far for London, a position that would set a pattern for decades to come.

With the core participants—France, West Germany, Italy, Belgium, the Netherlands, and Luxembourg—on board, negotiations began for a treaty to bring the plan to life. For nearly a year, delegations worked to flesh out the details of this unprecedented organization. The result was the Treaty of Paris, signed on April 18, 1951. It was a dense, hundred-article document that laid out the institutional framework for the European Coal and Steel Community (ECSC).

At the heart of the ECSC was the High Authority, the executive body Schuman had proposed. Its members were to be appointed by national governments but were sworn to act independently, in the common interest of the Community. Jean Monnet himself became its first president. To balance this new supranational power, the treaty also established a Council of Ministers, composed of representatives from the six national governments, to give them a voice in the decision-making process.

Furthermore, the treaty created a Common Assembly, the forerunner of the European Parliament, made up of delegates from national parliaments. While its initial powers were limited to supervision, its existence established the principle of democratic oversight. Finally, a Court of Justice was created to interpret the treaty and settle disputes, establishing a legal order that stood above national law in the specific areas of coal and steel. This four-part institutional structure—an executive (the High Authority), a council of states (the Council of Ministers), a parliamentary assembly, and a supreme court—would become the blueprint for all future European communities.

After ratification by the six national parliaments, the Treaty of Paris came into force on July 23, 1952. The European Coal and Steel Community was born. Its first task was to create a common market. On February 10, 1953, customs duties, subsidies, and other restrictive practices on coal, iron ore, and scrap were abolished among the member states. The common market for steel followed a few months later.

The immediate economic effects were dramatic. Trade in coal and steel products within the community soared. The High Authority worked to eliminate cartels, modernize production, and ensure fair competition. By providing equal access to raw materials, it fueled the post-war economic boom, known in Germany as the Wirtschaftswunder and in France as Les Trente Glorieuses. Most importantly, the ECSC worked. It provided a practical, successful example of how former enemies could pool their sovereign interests for the common good. It took the raw materials of war and turned them into instruments of a lasting peace. This first, limited, but profoundly successful experiment laid the essential groundwork for everything that was to follow.