Jean Baudrillard said this quote
“ Why did this [Vietnam] war, so hard, so long, so ferocious, vanish from one day to the next as if by magic?Why did this American defeat (the largest reversal in the history of the USA) have no internal repercussions in America? If it had really signified the failure of the planetary strategy of the United States, it would necessarily have completely disrupted its internal balance and the American political system. ”