Early during the conflict that became world war ii, the united states' involvement could best be described as
imperialism
intervention
isolation
diplomacy

Isolation.

They tried to stay out of the line of fire, letting the Europeans run rampid about, as they tried to fix their own problems. Continually point fingers at U.S, trying to get them to act. U.S eventually got dragged in, due to the fact that Japan had attacked the United states, and well yeah.