I would have to say European history for me, specifically German and/or the Germanic world. However, this was never really touched upon while I was in school. At least not beyond WW1 and WW2.

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I am a liberal, a classical liberal. Classical liberalism is liberalism, but the current collectivists have captured that designation in the United States. In Europe they are glad enough to call themselves socialists. But no one in America wants to be called socialist and admit what they are.