Answer:
Step-by-step explanation:
At the time, the alliance was based around destroying the fascist regimes in the Europe and Japanese expansionism in the Pacific. However, by 1945 the major fighting in both the European Theater and Pacific Theater began to come to an end. For example, World War II in Europe essentially ended with the death of Adolf Hitler on April 30th, 1945. Japan was defeated soon after in August of 1945 with the atomic bombing of both Hiroshima and Nagasaki. During these final stages of World War II, the partnership between the Soviet Union and the other Allied nations began to fall apart. This is best evidenced by the Allied wartime conferences in Yalta and Potsdam.
As World War II transformed both the United States and the USSR, turning the nations into formidable world powers, competition between the two increased. Following the defeat of the Axis powers, an ideological and political rivalry between the United States and the USSR gave way to the start of the Cold War.