There was all kinds of hatred for the Irish, Italians, Germans, Poles, Chinese, etc. 70–150 years ago.
Interracial marriage was illegal in the US south less than 50 years ago.
The arguments against Mexicans and Muslim refugees today are nearly identical, just with the names changed.
1940s Sinatra: https://www.youtube.com/watch?v=UpO6mpYvyqQ