Earlier quoted context omitted.
This all depends on victory conditions. The U.S. "won" Korea, Iraq, Vietnam, and Afghanistan in the same sense that they "won" WW2 - those countries were bombed back into the stone age and the existing governments fell. But WW2 was fought as the U.S. was an ascendant (but not dominant) power among a number of peer rivals, and the U.S. was not the aggressor. It felt like a victory, because we emerged as the dominant p…
The government of North Korea did not fall or surrender. You can argue that it was a political win if the goal was defending South Korea, but militarily, it was a stalemate. North Vietnam conquered South Vietnam after we withdrew. It was in no way a victory for the United States. Afghanistan was arguably pretty similar, although we did install a new government while we were there. Germany and Japan, on the other hand…
The government of North & South Vietnam that I'm speaking of was France.
Acknowledged on the undercount of U.S. casualties in Iraq. It doesn't change my conclusion, though.
There's a sibling comment by delecti that's making the point that I'm driving at: what is the goal of war? Is it regime change? Is it to sell arms? Is it to kill people? If it's regime change, war in general is a remarkably ineffective way of doing that - it's pretty rare that the victorious powers get the government they actually want, otherwise we would never have had to fight WW2. If it's killing people or feeding the military-industrial complex, the U.S. was pretty good at that in all the wars listed.
Incidentally, Vietnam is currently one of the most capitalist countries on Earth. So politically, the communists were defeated. All we had to do was let them govern the country for 15 years and everybody realized they didn't want communism.