What happened in World War II

World War ll was the biggest and deadliest war in history,involving more than 30 countries. Sparked by the 1939 Nazi invasion of Poland, the war dragged on for six (bloody) years until the Allies defeated Nazi Germany and Japan in 1945.

Explanation:

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where is the rest of the question. this isn't making sense. can you upload a picture of the question?

answer; sociological imagination;