Comment by brm

The fear is due to racism, scapegoating, and a general inability to cope with a changing population...

https://thinkprogress.org/poll-americans-anti-immigrant-atti...

http://journals.sagepub.com/doi/full/10.1177/136843021667730...

http://groups.psych.northwestern.edu/spcl/documents/Craig_Ri...

http://press.princeton.edu/titles/10516.html