What's one giant LIE that's frequently taught in schools as a lesson?

because through happy accidents (US tried to consciously do this through denazification but that was abandoned, while the USSR did successfully consciously do this for East Germany), the young (West) Germany was instilled with an extremely high sense of historical remorse partly because they were young.

i’ve never heard people say even half of “US is a young nation, they don’t understand history”