Some of the quotes I originally considered using, but had to let go are:

"Chinese are inferior to any race God ever made" —Frank M. Pixley representing the municipality of San Francisco before the Congressional Committee of 1876. (Congressional Policy of Chinese Immigration By Tien-Lu Li)

"The desire for profit had temporarily triumphed over the desire for population purity." (Desperate crossings By Naomi Flink Zucker, p.14)

"Exclude immigration from all members of the African or black race" —Senator James Reed of Missouri in an attempt to exclude people from the Caribbean in an amendment to the immigration bill of 1914. These people had been working on the Panama Canal and had settled in the United States. (Making Americans By Desmond King, p. 152)

"The world was divided into places where refugees cannot live and places into which they cannot enter" —Chaim Azriel Weizmann, the first president of the State of Israel, talking about the refugee crisis at his time.

"20,000 charming German children would all soon grow up into 20,000 ugly adults" —Laura Delano, one of FDR's family members and wife of James Houghteling. (A companion to 20th-century America By Stephen J. Whitfield p. 222)