If the US attacked Germany, the rest of Europe would instantly go to war with the US. Russia would likely attack the US as well (as good a time as any) and who

If the US attacked Germany, the rest of Europe would instantly go to war with the US. Russia would likely attack the US as well (as good a time as any) and who knows what China might do. The US spends the most on military but considering they haven't won a fight since WWII (which would have ended the same with or without them) I don't see that they're that good.