In London, the United States, United Kingdom, France, and the Benelux countries met to plan a new political and economic framework for the western occupation zones. The talks pointed toward creating a separate West German state and moving ahead with economic measures, deepening the split with the Soviet Union. These decisions helped set the conditions for a direct confrontation over Berlin.
A major currency reform replaced the unstable Reichsmark with the Deutsche Mark in the western zones. The change was meant to restart normal economic life and reduce the black market. Soviet leaders viewed the reform as a step toward a separate West Germany and a threat to their influence.
The Soviet Union cut road, rail, and canal access from the western zones into West Berlin. This move aimed to pressure the Western Allies to reverse currency changes and weaken their position in the city. About 2.5 million civilians in West Berlin faced severe shortages unless supplies could be brought in by another route.
The United States and United Kingdom began flying food, fuel, and other essentials into West Berlin using agreed air corridors. This operation—often called the Berlin Airlift—tested whether a large city could be supplied mainly by air for an extended period. The airlift became a major early crisis of the Cold War and a public demonstration of Western commitment to West Berlin.
As the blockade continued, leaders in the western zones moved toward creating a new West German state. A Parliamentary Council met in Bonn to draft what became the Basic Law, a constitution designed for a federal democracy. The work signaled that the political split of Germany was becoming more permanent.
Through late 1948, the airlift scaled up to keep West Berlin supplied through the winter, when coal was especially important for heat and power. Aircraft landed in a tightly managed schedule to maximize deliveries and reduce congestion and accidents. The continued flow of supplies reduced the blockade’s leverage and increased Soviet political costs.
Twelve countries signed the North Atlantic Treaty, creating NATO as a collective defense alliance. The Berlin crisis was one of the key events shaping the sense of shared security among Western states. NATO’s formation reflected a longer-term shift toward organized military cooperation against perceived Soviet pressure.
By spring 1949, the airlift had become highly efficient, with aircraft arriving at extremely short intervals. On April 16, 1949, deliveries reached a record level of 12,941 tons in one day. The performance showed that the blockade was failing to force a Western withdrawal from Berlin.
After 324 days, the Soviet Union reopened land and water routes to West Berlin at midnight on May 12, 1949. The Western Allies had not abandoned their position in Berlin, and the airlift had kept the city functioning. Even so, the crisis confirmed that Berlin would remain a central pressure point in East–West relations.
The Parliamentary Council promulgated the Basic Law, establishing the constitutional foundation of the Federal Republic of Germany (West Germany). The document set out democratic institutions, federalism, and fundamental rights. Coming soon after the blockade ended, it underscored how the crisis accelerated the political division of Germany.
Although the blockade was lifted in May, air deliveries continued for months in case access was cut again. On September 30, 1949, the Western Allies ended the airlift after concluding the immediate risk had eased. The operation delivered more than two million tons of supplies and became a lasting symbol of West Berlin’s connection to the West.
On October 7, 1949, authorities in the Soviet occupation zone put a new constitution into effect and proclaimed the German Democratic Republic (East Germany). This step completed the immediate post-blockade move toward two German states aligned with opposing Cold War blocs. Berlin remained divided, making it a continuing focus of international tension.
Berlin Blockade and Airlift (1948–1949)