the US.
America sabotaged a key and extremely strategic asset of Germany's energy supply infrastructure knowing perfectly that the Germans won't do anything about it.
Germany is such a good boi.
Germany is prosperous BECAUSE it is obedient to the United States, or rather because it belongs to the so-called "Atlantic Alliance". West Germany's post-War prosperity (and East Germany's post-Cold-War prosperity) comes precisely from this. If you want to see what a Soviet-dominated Germany or Western Europe could have looked like, one needs to look no further than the Warsaw Pact Communist countries, including Russia itself. Now, I don't think it necessarily had to be this way, that the post-war market economy had to be as successful as it was in Western Europe (the Western European countries could have gotten stuck in a middle-income equilibrium), but so it was.