West Germany remained occupied for about 4 years and then quickly transitioned to a high degree of independence (because of Cold War strategy reasons).
Additionally it had been fully developed for hundreds of years so there can be no comparison.
Yeah, 80 years of occupation and stabilization later they sure could. That's why we did it, to prepare them to support themselves again but from a more stable base.
But what's your point? That colonization doesn't always work? Sure.
Additionally it had been fully developed for hundreds of years so there can be no comparison.