How did the United States go from a policy of isolationism to active involvement in World War II

The bombing of pearl harbor  

Explanation:

The USA sanctioned Japan before the bombing due to Japans invasions of other countries such as China

They switched from isolationism to being involved because they were attacked by the Japanese in 1941.

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answer; people where able to travel across the u.s.a faster than any other mode of transportation,travel time was about a week,from coast to coast