What was the main reason why the US officially joined WWII on the Alliesâ side? the Zimmerman Telegram was intercepted, and the US was worried that Germany was attempting to get Mexico to attack from the south the US was concerned that Germany was close to creating and using an atomic bomb in Europe the surprise attack at Pearl Harbor in Hawaii on December 7th, 1941, killing Americans and destroying American ships and airplanes. all of these
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USA joined WWII due to bombing of Pearl Harbour by the Imperial Japan
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