The anger over illegal immigrants taking US jobs is mostly fearmongering from the people employing illegal immigrants.
I'm not so sure..
It’s a playbook as old as time. “At least we’re not <the other guy>”
When slavery was a thing, white southern workers made a lot less than northern workers. Racial superiority pumped the suckers up. Johnny Reb volunteered to be slaughtered so some aristocrat could own people.