There might be something in the history of Empires like Rome, where over generations minority groups are assimilated into the dominant culture. Give it a few ge

There might be something in the history of Empires like Rome, where over generations minority groups are assimilated into the dominant culture. Give it a few generations and nobody remembers relations 100 years ago. In the US people today tend to forget the surge of nativist sentiment in 1920 towards... Italians. Or before that... Germans.