During the Potsdam conference of July 17th 1945, it was decided that Germany was to be split into four zones: France, Britain and America occupying West Germany and West Berlin, while the USSR occupied East Germany.
However, the difference between the two sides were that the allies were trying to rebuild Germany, whereas Russia wanted to loot it. On the other hand, the zones of United States and Britain merged together to create the Bi-zonia.
On March 1948, the Allies decided to merge there zones together into a Country in which they named West Germany.
On June 23 1948, the Allies introduced a new currency into Western Germany called the Deutschmark. Stalin was furious about this because he wasn't being included in this. He though that the allies where trying to push him out.
On June 24, the USSR announced that the Allies no longer had any rights in Berlin. This meant that the USSR cut off the roads, train routes and cannel routes. This was the start of the Berlin Blockade
Because of blockade Truman stated in the Truman Doctrine because the Allies didn't want to just abandon Berlin. Therefore, 275000 planes transported 1.5 million tons of supplies to Berlin in a period of 318 days. On 12 May 1949, Stalin abandoned the blockade.