The dollar was replaced in 1933, when the provision of the Constitution which says that nothing can be legal tender except gold and silver coin was suspended by executive order.
Federalist 69, last one or two paragraphs, compares and contrasts the prerogatives of a king and the President. The president cannot proscribe rules regarding the currency of the US.
Do you have the number for that EO?
I'm thinking we need to get rid of executive orders.. Clinton taught us that lesson....
And step by carefully plotted step from the board rooms of hell have been achieved for decades.