Germany was liberated from the national socialists during WWII, and look at them now.
Primarily because the national socialists invaded neighboring countries and Europe had to either fight back or be conquered. And even then, the United States didn't get involved until Pearl Harbor was bombed AND the national socialists officially declared war on us.
Since then, we've tried nation-building in Korea, Vietnam, and Iraq, and it's went stuffty every single time. It didn't even go particularly well in Germany either - remember the decades when Berlin was split up because the Soviets claimed half the city?
On a mostly unrelated note, anyone who earnestly votes yes in the current poll is handicapped.