"Divide and conquer" came from the Romans. ancient Greece.
The maxim divide et impera has been attributed to Philip II of Macedon. It was utilised by the Roman ruler Julius Caesar and the French emperor Napoleon... (Wikipedia)
Exactly. I just looked it up to be extra sure, the wording itself is at least as old as Machiavelli and the strategy as old as antiquity. (Let's be honest, probably even prehistory).
The Nazis were delusional, but even in their wildest dreams they didn't plan to conquer the United States.
Americans are so historically illiterate, it hurts.