German Reunification
On 3 October 1990, the German Democratic Republic (East Germany) ceased to exist and its territory joined the Federal Republic of Germany (West Germany). Four decades of division came to an end, and the most visible fault line of the Cold War disappeared. Reunification reshaped the balance of power in Europe, enlarged the Western alliance system, and left Germany as the continent's most populous state and largest economy.
Germany had been divided after its defeat in 1945, when the victorious Allies split it into occupation zones. As relations between the Soviet Union and the Western powers soured, the zones hardened into two states in 1949: a democratic, market-oriented West and a one-party socialist East. Berlin, deep inside East German territory, was likewise divided, and in 1961 the East German government built the Berlin Wall to stop the flow of citizens leaving for the West. For decades, the border was heavily fortified, and many people died trying to cross it.
The end came quickly. In the late 1980s, Mikhail Gorbachev's reforms in the Soviet Union weakened the willingness of Moscow to prop up allied governments by force. In 1989, Hungary opened its border with Austria, thousands of East Germans fled via Hungary and Czechoslovakia, and large peaceful demonstrations, notably in Leipzig, challenged the ruling regime. On 9 November 1989, after a confused announcement about travel rules, crowds crossed the Berlin Wall and border checkpoints opened. The East German leadership soon lost control.
Unification then moved faster than many had expected. West German Chancellor Helmut Kohl pushed for rapid union, and in March 1990 East Germans voted in their first free parliamentary election. A currency union followed in July 1990, bringing the West German mark to the East. The international side was settled through the "Two Plus Four" talks among the two German states and the United States, the Soviet Union, Britain, and France, which confirmed Germany's borders and allowed a united Germany to remain in NATO. The Soviet Union also agreed to withdraw its troops.
The consequences were profound and mixed. Germany regained full sovereignty, and the European Union deepened its integration in the following years, partly as a framework for a larger Germany. Within the former East, however, rapid economic restructuring closed many factories, causing high unemployment and significant emigration westward. Large public transfers helped rebuild infrastructure, yet differences in income, wealth, and political attitudes between east and west have persisted. Historians continue to debate whether a slower, more negotiated path might have eased these strains, but the peaceful end of the division remains one of the defining events of the twentieth century.