[z3phyr]

Theorotically, in a world without consequences the USA can take out multiple powers very easily.

Practically (and without usage of nuclear weopons), the USA can barely handle attrition. Also the USA have not fought a conventional war with another competent regional power since World War 2 and that too was with many allies.

[_8j50]

Even something like vietnam would be very difficult now with all the internal division and the prelude strife they'll cause.