The document discusses several events in Germany after World War 2 that contributed to tensions between the Western allies and Soviet Union, leading to the Cold War. It describes how Germany was divided between the allies after the war per the Potsdam Agreement, but the Soviets were unhappy with Western involvement in East Germany. This tension increased as the Western zones unified into West Germany in 1949. In response, the Soviets blockaded land access to West Berlin, but a massive Western airlift undermined this move. While angering the allies, the blockade failed and ended in 1949, showing the tensions had deeper ideological roots that would characterize the long Cold War.