The document discusses the Berlin Blockade of 1948-49, which arose from tensions between the Soviet Union and Western allies over the division of Germany after World War II. Stalin's blockade aimed to counter Western economic initiatives and ultimately led to the Berlin Airlift, through which the Allies supplied West Berlin by air for eleven months. This event marked a significant escalation in Cold War hostilities, resulting in the formation of West Germany and NATO, alongside the USSR's establishment of the Warsaw Pact.