2 Biggest U.S mistakes of the 20th century.

[SobieskiSavedEurope]

SobieskiSavedEurope

The two mistakes described in the OP don't even come close to the biggest ones, sorry. You're like, by the wall in left field with that.

What's a bigger mistake, then selling out our nation to foreigners whom are often hostile to us?

NAFTA and The Patriot Act. You asked, I told.

Clinton giving our missile technology to China. That was downright traitorous.

NAFTA is up there, no doubt, but the Hart-Celler immigration act flooded this nation with immigrants, NATFA was more just another nail off of that, and the Nixon - Kissinger free trade with China, propped up a often hostile China to us, with jobs leaving the U.S in mass for China.