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Who would the US military get bodied by the hardest?
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Given their track record, any guerilla military force with a few assault rifles, apparently.
The honest answer is China, but I would hope the US crumbles from within before it ever comes to that. While I have no doubt that the US would be crushed, I also have no doubt that the loss of life (nevermind the environmental fallout) would set humanity back decades. That's assuming the US didn't resort to nuclear weapons as a last gasp.