The United States foreign policy shifted drastically between the end of World War I and the end of the Korean War.
At the end of World War I, the US returned to a policy of isolationism. This meant that the United States did not want to get involved in foreign affairs/wars. The US was only interested in working with other countries from an economic standpoint.
However, the US policy after the Korean War was focused on getting involved in foreign affairs whenever the issue of communism arose. The US government adopted a policy of containment after World War II. Essentially, th US would use military force and any other means necessary to stop the system of communism from spreading to countries all over the world. This showed that the US transformed from a country that did not want to get involved in foreign affairs to a country that was consistently involved in foreign affairs.
