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Which caused the US Army to take over the atomic research project being conducted at Columbia University in the early 1940s?
the first atomic bomb test
a letter from Albert Einstein
Japan’s research into atomic bombs
the US entry into World War II

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Answered by GPT-5 mini AI
The US entry into World War II.

After Pearl Harbor the project was militarized for wartime urgency, and in 1942 the Army (Manhattan Engineer District) took over the atomic research being done at Columbia and elsewhere.