Once the United States entered World War II, the State Department practiced stricter immigration policies out of fear that refugees could be blackmailed into working as agents for Germany.http://www.ushmm.org/wlc/en/article.php?ModuleId=10007094It was not until January 1944 that President Franklin D. Roosevelt, under pressure from officials in his own government and an American Jewish community then fully aware of the extent of mass murder, took action to rescue European Jews.
Also check out immigration policies towards Russia after WW1, primarily bolsheviks.
Excellent post. History is lost on these idiots. On purpose in my opinion. H*LL half my Grandparents family was either deported back to Germany, or sent to camps in Texas til after the war. Lol. They were microagressed! ;)