Who decides how much of my country you give away?
I wouldn't put that this way :
I don't have any power whatsoever on the way you as US citizens manage immigration : we have similar problems here, but they're not the same.
Like you, we "can't accept all the misery of the world".
Yet, most of the immigrants that come to Europe are citizens of former colonies that were exploited by European countries, and are still left in a status of dependancy from their former masters who control their resources. In the past, it was slavery, today, it's primary resources in the hands of financial groups. You can't really blame people who want an even share of the cake.
What's more, immigrants, whether legal or undocumented are an indispensable part of the labour force : send all illegals behind the "wall", and the economy of the whole south-west will collapse. Not to mention what immigrants, legal or not, contribute to the economy as consumers.
Once again, yes, it must be controlled, but not in this hateful, racist way some governments do,
One of the differences I might see here and there is, "California, Los Angeles, Monterey, San Francisco, Salinas, San Diego..." : well, isn't that a Hispanic country ?
"ethnically and religiously different "
???
"Urrea opines that one of the sources of the ongoing border conflicts is a fundamentally different understanding of the border itself -- partly due to history. The Spanish word for border, "frontera," means frontier, and connotes not just a boundary or a divider, but also an opening. It points less to itself than to what's beyond. This understanding stems in part from the fact that historically in Mexico (a long narrow country that runs vertically rather than horizontally) the "frontier" has always been north (not west, as in America)."
The Devil's Highway: A True Story By Luis Alberto Urrea - Little, Brown, 239 pp.