The 21 years between 1920 and 1941 we have a period of change in the United states foreign policy. The policy changed from an isolationist policy that focused on the U.S. itself to on of fear of what would happen to the free world if we didn’t fight in the second world war. We were reluctant because we didn’t want things to end up the way the first world war had. The U.S. feared that the war would cause more European debt to the U.S., which they wouldn’t be able to pay back for a long time, and the fear that America would become even more isolationist. There was peace with America's european relations but everything changed when the Japanese attacked. The unprovoked attack on Pearl Harbour by the Japanese sparked the fighting spirit in America