Communism
By the 1960s, one third of the world had overthrown capitalism and were trying to build communism. Most of these countries followed the model of the Soviet Union. Some followed the model of China. The other two thirds of the world still lived in capitalism, and this led to a worldwide divide between capitalist countries and communist countries. This was called the "Cold War" because it was not fought with weapons or armies, but competing ideas. However, this could have turned into a large war. During the 1980s, the United States and the Soviet Union were competing to have the biggest army and having the most dangerous weapons. This was called the "Arms Race". President Ronald Reagan called communist countries like the Soviet Union the "Evil Empire" because he did not agree with communist ideas.