July 1938. Fewer than 5 percent of Americans surveyed at the time believed that the United States should raise its immigration quotas or encourage political refugees fleeing fascist states in Europe — the vast majority of whom were Jewish — to voyage across the Atlantic. Two-thirds of the respondents agreed with the proposition that “we should try to keep them out.”
Then a later poll:
Two-thirds of Americans polled by Gallup’s American Institute of Public Opinion in January 1939 — well after the events of Kristallnacht — said they would not take in 10,000 German Jewish refugee children.