re: Would the Allies have won WWII without America getting involved?

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And a protracted war could very well have allowed one or both sides to split the atom. and depopulate Europe.

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This is the wild card. Would either side have come up with nukes without the US doing so if the war dragged on long enough? I'm not well read enough on the efforts of other countries in that regard. Even if they were on the wrong track, they could have switched gears and eventually come up with atomic weapons given enough time I guess.