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The Cold War was a geopolitical conflict between the United States and the Soviet Union that lasted from 1947 to 1991. The origins of the Cold War can be traced back to the end of World War II, when the Soviet Union and the United States emerged as the two superpowers of the world. The two nations had different ideologies and political systems, which led to tensions and mistrust between them.
One of the main factors that contributed to the start of the Cold War was the Soviet Union's expansionist policies. The Soviet Union wanted to spread communism throughout the world, and this led to conflicts with the United States, which was committed to containing the spread of communism. The Soviet Union's annexation of Eastern Europe and its support for communist movements in other countries were seen as a threat to the United States and its allies.
Another factor that contributed to the start of the Cold War was the arms race between the United States and the Soviet Union. Both nations developed nuclear weapons, and this led to a dangerous standoff between the two superpowers. The fear of a nuclear war was a constant threat during the Cold War, and both nations spent billions of dollars on their military and defense programs to maintain their strategic advantage.