Question

In the early 1940s, the United States was determined to prove to the world that her motives for entering World War II were:

imperialistic
to attack Russia
to re-establish peace in the world
to gain new possessions

Answer 1

to re-establish peace in the world

Answer 2

In the early 1940s, the United States was determined to prove to the world that her motives for entering World War II were "to re-establish peace in the world," since most of the US was isolationist at this time.