How was the Berlin crisis resolved?

The Berlin Crisis (or, Berlin Blockade) of 1948-1949 was resolved through a combination of two related factors. The first was Allied resourcefulness and determination, with a nearly miraculous effort being made to keep West Berlin supplied through many months of land-access isolation. The second was the (very realistic and otherwise sensible) willingness of the Soviet Union to concede defeat in its bid for control of West Berlin.