> it shall be unlawful for any citizen of the United States to depart from or enter, or attempt to depart from or enter, the United States unless he bears a valid United States passport.
Approximately nobody uses US coins outside the US. Even in countries where the dollar is widely accepted, trying to use coins will get you weird looks at best.
Your best example of a "historically efficient way to solve political problems" is a 4 year civil war that killed more than half a million people and, after all that, still left African Americans as second-class citizens for a century after?
https://www.law.cornell.edu/uscode/text/8/1185#b