Why was Hitler a threat to the united states in the 1940's? Strictly the 1940's

It began after the stock market crash of October 1929, which sent Wall Street into a panic and wiped out millions of investors. Over the next several years, consumer spending and investment dropped, causing steep declines in industrial output and employment as failing companies laid off workers

Hitler was a threat to the US in 1940s because, that was the decade when they started the atomic bomb project and could wipe out millions.

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