Afghanistan, maybe? U.S. and Societ completely ruined the country in the 60s, 70s, 80s and 90s (in the 90s Soviet were gone and U.S. involvement was passive and indirect though, bu they "blessed" The Taliban as an ally nevertheless), and in the past decade U.S. and Europe have helped kinda rebuild the country by technical and financial aid.

I quite and completely agree with your comment; because that's exactly what I think (I've spent a great deal thinking about that).