Explain the transition from isolationism to participation in WWII in a paragraph.

Explanation:

Roosevelt was not an isolationist at heart. But WWI was still fresh in the minds of the general public. Many families had lost relatives which up until WWII was the most devastating war the world had seen. Many Americans didn't want to get involved in Europe's politics and problems. A marvelous movie has been made about this called The Americanization of Emily staring a very young Julie Andrews (who does not sing a note) and a very handsome earthy James Garner. It captures beautifully how Americans felt about getting involved in other people's wars.

Roosevelt himself wanted to help Great Britain, but the problems with domestic worries in the United States forced him to hesitate. He needed something to motivate the public into getting into a war they did not want.

Japan provided him with Pearl Harbor. The American Public was moved into action. Some of the Japanese knew it, including the architect of the attack on Pearl Harbor (Admiral Yamamoto who famously said "All we have accomplished was to awaken a sleeping giant.")

So began the bloodiest war the planet has ever seen.

I'm sorry this is so long, but you cannot talk about the transition period of WWII without knowing how people felt.

la segunda guerra mundial comenzó el 1 de septiembre de 1939 y terminó el 2 de septiembre de 1945. ¡espero que esto ayude!