In every conflict since WWII the US mil won conventional war and it has a better fighting force and weaponry than any country (and bases+carriers+allies). What they lost every time is public support for the war long after dominance and/or invasion has been established.

I mean, look at afghanistan, the war ended in 2004. The US could have declared that country their new territory and every conflict would be domestic terror. They did not need to stay after 04, they stayed to keep the place stable not to defeat the taliban (which militarily, they did).