If caught by the Nazis, they would be killed instantly, if caughted by some americans, they would be rejected
The White Russians - orthodox Jews - fled Russia to America
The death of King Ptolemy caused the Auletes to flee Egypt.
some tried to flee, some stayed.
They did not need to flee. Spain was never occupied, nor did it have to surrender its Jews.
The Abbasids persecuted the Fatamis, which caused them to flee.
The potato.
Because of the Holocaust. So they could be safe.
South America had easier immigration requirements than the USA or Canada and was distant enough from Nazi Europe that Jews who went there would not risk the Nazis conquering their host nations in the near future. Ironically, these easier immigration requirements ultimately led to the Nazis who fled from Allied capture and imprisonment to flee to South America as well.
i suppose you can
Holland.
Yes, but he lived in America later in his life because he was Jewish and had to flee Nazi Germany. He is most famous for his Law of General Relativity, which describes what we feel as gravity.