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Answer:

Formal Entry into the European Theater. The United States entered the war in the west with Operation Torch in North Africa on November 8, 1942, although in mid-1942, the U.S. Army Air Forces (USAAF) arrived in the U.K. and carried out a few raids across the English Channel.

Hello there, to answer your question...

The us became involved in the European theater by...

starting with Germany's invasion of Poland on 1 September 1939 and ending with the United States, the United Kingdom and France conquering most of Western Europe

I hope this information helps. :)