The Cold War
The Cold War referred to the competition, the geopolitical tensions and a series of confrontations between the United States and the Soviet Union, backed by their respective allies. Eastern bloc : USSR and its satellite countries Western bloc : USA and its NATO allies End of Second World War The world war ended when the United States dropped two atomic bombs on the Japanese cities of Hiroshima and Nagasaki in August 1945 , causing Japan to surrender. Some opinions say that the US decision to drop atomic bombs was in fact a strategy to show the Soviet Union that US was the supreme power and stop it from making gains in Asia and elsewhere.