It doesn't matter what happened to creditors centuries ago. As it stands right now it is inconceivable that the US could or will pay off all its present and future creditors in real terms. Someone has lost a lot of money (presumably China and Japan). How could the US pay them back without resorting to fantasy? The debts are too high and the US economy is not big enough for any strategy to be politically feasible. Even coming up with a serious scenario where the US tries to pay down its debts is hard. It is likely that they are going to keep running up debts until they can't pay the interest any more, then default.

The best outcome the US can achieve is semantic games where they pretend that giving people back less than was borrowed is somehow reasonable.