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The thing with US is that it is dependant on the rest of the world for its economy and energy needs. If the whole world decided to attack the US, the country would crumble because of the lack of resources and manufactured goods. Many US companies have factories overseas, many of them depend on foreign trade.
Secondly, let's not forget that the US couldn't simply invade Europe, Russia, or China. They could carry out random airstrikes, but not much more than that. It is likely that the US would be winning military fights in the beginning, but ultimately, the rest of the world would manage to invade. Like with Germany and Hitler. They did have the strongest military at the time, but even with their allies they simply couldn't have reached the amount of industrial production that the rest of the world had.
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1+1=10
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