E. It so stated that it started with the crashing of the stock market.
Answer:
Because at the time, the American army was still segregated, and African Americans were discriminated in the army, even if they provided the same service for the country during the war against Germany and Japan.
Fortunately for African Americans, the army was desegregated after the war, and in the following decades, the Civil Rights Movement would lead to desegregation in most public and private places across the country, especially in the South.
It was primarily the "B. Young American" movement that was in favor of U.S. expansion in Latin America, although it should be noted that there were others who were in favor of such expansionism as well.
