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Overnight, the freedom to pass between the two sections of Berlin ended. Running across cemeteries and along canals, zigzagging through the city streets, the Berlin Wall was a chilling symbol of the Iron Curtain that divided all of Europe between communism and democracy. Berlin was at the heart of the Cold War. A 1948 map detailing the Berlin Blockade, one of the first major international crises of the Cold War. During the multinational occupation of post-World War II Germany, the Soviet Union blocked the western allies' railway, road and canal access to the sectors of Berlin under Allied control. When Khrushchev's December 1961 deadline passed without incident, the conflict over the future of the city receded with no further Soviet agitation concerning a treaty. A major outcome of the Berlin crisis was a new understanding between the United States and the Soviet Union.