The US has one of the most easily forged currencies in the world you would have thought they'd done something about it by now. You just bleach low denomination bills and then print hire denomination bills on the resulting blank paper. It's such an utterly stupid hack that absolutely should not work.

That's how Trump is planning to make his $250 bill. He's just going to print them on bleached $1 bills. It's the sort of thing he would do.

Pretty much only the us has such terrible currency design.