You got sources on any of that?
You do understand why there are less jobs and lower wages where they come from is often directly tied to wars generally driven by western powers. Many still curently active even. Hati, Cuba, Palestine, nearly all of South America.
Do you really know any of these people to speak like that of them? I do, and that's not representative of most of them. Chile, Brazil, Ecuador, Venezuela, Bosnia, Palestine, Haiti. All of them are already planning to return the moment it becomes viable. The main reason several of the Bosnians I know are still here, has nothing to do with commercial opportunity etc. But the fact that they had kids born and raised here and didn't want to uproot their lives as well. Several moved back the moment their children moved out.
If they come here for education, something we are going to see less and less of in the US for sure as we collapse. Why is that something to hold against them. Without many of them we'd already be fucked. And plenty of them go back home to improve things there too.
And hate to break it to you. Immigrants don't lower wages. Capitalists do. We allow them to exploit unprotected classes. You want wages to go up? Give migrant workers similar protections as local workers. So they can't be exploited worse than local workers.