America was the driving force in the capitalist economy, and was the poster child of the capitalist ideology, with the concept of the "American Dream" encapsulating all of its ideas. After the Second World War, America's main threat became the incoming growth of communism throughout the world, and stemming from the USSR. Although these nations were very much aware of each other' ideologies during World War 2, the larger threat of Hitler brought them to be allies. After that fight had ended, these different forms of government saw each other as their main opposition.