If all government actions from any point in time are what matter, and not the democratic opinions of the populace or the actions of the current government, then I'd say the worst was Mongolia under Genghis Khan.

This is emphatically wrong on every level. You're calling an entire country and it's inhabitants xenophobic, yet you're referring to the actions of a far-right figure we not only voted out of office, but never voted to put in in the first place (he lost the popular vote.)

You're ironically very xenophobic - even if you are American. Because most Americans are welcoming as part of our culture. To be against that is not only wrong, it's also very unfounded.