Immigrants
https://www.nap.edu/read/21746/chapter/2
https://www.migrationpolicy.org/topics/citizenship-civic-engagement
https://www.amacad.org/publication/political-and-civic-engagement-immigrants/section/5
More on Salad Bowl and Melting Pot
https://www.hoover.org/research/melting-pots-and-salad-bowls
http://www.ascd.org/publications/educational-leadership/may94/vol51/num08/Melting-Pot-or-Mosaic%C2%A2.aspx