If anything, modern America has more reasons to welcome immigrants, not fewer. Population growth is down, and our economy thrives on having people participating in it, and we have more tools to teach and integrate people from different backgrounds than they did. There's a lot more to be gained by solving the immigration crisis by lowering the bar to admission then trying to turn half a continent into a fortress.
Especially when the cure is worse than the disease.
https://www.newsweek.com/suspects-allegedly-impersonating-po...
https://abc13.com/post/suspect-arrested-allegedly-posing-ice...
https://abcnews.go.com/Politics/trumps-calls-guard-units-tas...