In the late 19th and early 20th centuries, many Jewish refugees immigrated to America from Eastern Europe, fleeing pogroms and ridiculously hard economic conditions. Many Americans didn’t trust them.
Three (and more) generations back, my paternal family were full-blooded Jews. They also came here in that time period, though from Western Europe (specifically Austria). Somehow, though, I seriously doubt that the American mistrust of Jews bothered to vet people as to what part of Europe they were from. So they were almost certainly all lumped in together.
Had my great-great-grandfather not come to America, it is highly probable that my family would have been in Austria for Kristallnacht. My grandfather would most likely have died in his 20s and my father and I wouldn’t exist.
Application of this (non-fiction) parable to current American attitudes toward refugees is left as an exercise for the reader.