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Forget "nation building", no way a nation can be "rebuilt' except the people want it that way...
Curiously, the US has not lost a war either...not the troops on the battlefield., anyway! Sadly the various conflicts were not lost by the troops, but by either a cowardly congress or a cowardly C-in-C..
One nortable exception Desert Storm..and that was likely because George H. somehow left it to competent generals to run operationsOf course, such competent generals maybe harder to find these days.
https://history.army.mil/html/bookshelves/resmat/desert-storm/index.html Desert storm was perfectly executed and carried out, and I was proud of my fellow tankers..especially their cool, brave actions inthe fight at "73 Easting".
In 100 hours, the 4th largest army in the world was obliterated. no small feat !