Ever heard of the Marshall Plan???
I stand corrected i should have said....the only nations that i have seen rebuilding nations after a war are empires that go to war to gain territory then build it up so the can take advantage of the cheap labor and/or have a political and military hegemony over them...

Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice:And be ye kind one to another, tenderhearted, forgiving one another, even as Elohim for Yahushua the Messiah's sake hath forgiven you. Ephesians 4:31-32