United States
After World War II, the United States and the Soviet Union started the Cold War. This was because both of them thought their own type of government was the best. The United States was supported by NATO, and the Soviet Union was supported by the Warsaw Pact. They never fought each other directly, but did many proxy wars. In the Korean War, the United States sent soldiers to help South Korea. They fought Chinese soldiers that were helping communist North Korea. In the 1960s, the Cuban Missile Crisis almost led to a real war between the two countries. However, the Soviets agreed to take their missiles out of Cuba if the United States did not attack them. Because of the Cold War, many Americans were scared of communist spies taking over the United States. This started the Second Red Scare, and hundreds of people were arrested because they were communist. Later, many cases in the Supreme Court made arresting communists illegal, because it is free speech.