Allies had to air lift supplies into West Berlin because the USSR had all roads blockaded. The eastern part of the city was under the control of the USSR, and the western region was under the control of the allies. The USSR hoped that by shutting off all routes, the allies would turn total control of Berlin over to them.
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When Stalin initiated the Berlin Blockade, he intended to force West Berlin to accept supplies from East Berlin, and therefore from the Soviet Union. In doing so, the USSR would effectively control all of Berlin. Western leaders knew this and began the Berlin airlift, supplying West Berlin with provisions entirely by air. After several months West Berlin was receiving more supplies than it was before, and Stalin eventually lifted the blockade to avoid further embarrassment.
The Berlin Blockade was supposed to cause the allies to give up western Berlin to the Soviet forces, but instead the allies constantly airlifted supplies past the blockade until it was lifted.
The Berlin Airlift.
U.S. President Harry S. Truman ordered supplies to be airlifted into West Berlin. This was done to prevent West Berlin from being overtaken by the Soviet Union.
The Berlin Crisis of 1961 began with the Soviet Union building a wall between East and West Berlin. The Soviets shut off access to West Berlin. The Allies responded with the Berlin Airlift and the crisis was resolved.
Berlin blockade. The Soviets blockaded West Berlin to force it to become communist (it was democratic). The Berlin Airlift is when the US airlifted supplies to West Berlin. You know so they don't give in to communism.