Respuesta :
U.S. foreign policy shifted away from "isolationish" to international involvement, mostly during and after World War II, when the United States emerged as the most powerful country on earth.
Answer: Isolationism
Up to the 1930s, the United States had maintained a policy of non-interventionism in global affairs. The 1930s reaffirmed this position, as the United States was facing difficult times at home due to the economic hardships of the Great Depression. The U. S. was determined to stay away from Europe's growing problem of fascism, believing that staying away from it would grant them immunity.
However, as the Nazi regime gained strength throughout the war, and after the attack on Pearl Harbour, the United States decided to change its policy. The country was also fearful of the effects that fascism could have on American democracy. Interventionism was then encouraged.