The American army did not lose the Vietnam War, but withdrew. It is also because I can't fight anymore and don't want to fight, so I didn't sign any treaties, only signed a truce and withdrawal treaty. After all, even if Vietnam is not persuaded, it can't reach the United States. ...
So it seems that in the case of a large-scale war, the United States has never surrendered to anyone ... nor has it paid any national war compensation, because every defeated country has to pay war compensation, and the United States has never paid this money, has it?