After WW2, Germany was split into 4 zones, the lands taken by the UK, USA, France, and Soviet Union. The City of Berlin, located inside the Soviet zone, was also split between the four.
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West/East Berlin
In 1948, the UK, USA, and France merged their zones to create West Germany. They also introduced the Deutschmark a new currency. This helped them to restore the economy of West Germany, and their area in Berlin.
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Berlin
The Soviet Union thought it was important to cut off West Berlin to the west in order for it to fall to the Soviets so they didn't want supplies entering West Berlin, because it was inside East Germany. Therefore, they blocked off all road, rail and canal entrances to Berlin for the Western Allies.
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Berlin
Because of the blockade, the Western Allies attempted to send 4,000 tonnes of supplies into Berlin per day, even through the harshest conditions. The Soviet Union couldn't do anything, as shooting down the planes would result in war.
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Berlin
In May 1949, Stalin lifted the blockade and allowed cars, rail, and ships to enter West Berlin It was damaging the reputation of the Soviet Union, and the Western Allies were easily avoiding it.
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This blockade led to the creation of NATO (North Atlantic Treaty Organisation) with the west in order to counter the Soviet influence, and the creation of the Warsaw Pact between the Eastern Bloc.