Who are some of the refugees who have fled political or social tyranny and come. To the United States in recent decades?

I'm thinking this question isn't directly connected with the book. Some refugees escaping tyranny today could be from Syria or various other places in the Middle East. Syria seems to be a hot spot right now for some pretty bad stuff.

You could consider Croatia/Serbia from their civil war as well. The US and Canada have taken refugees from various hot spots in Africa like the Civil War in Rwanda.