Current immigrants aren't coming to America, they're coming to Whiteland. There's a big difference between the two. Immigrants aren't looking for open spaces and the chance to build settlements and create new possibilities for self-governance and personal liberty. They want the "whitepeoplebuiltthis" lifestyle without all the work it took to actually build it.
Would they come to America without Americans, or go to Australia without Australians, or to Sweden without Swedes? Of fucking course not. So the "coming to America" argument is bullshit. They are coming to Whiteland for "whitepeoplebuiltthis" life. Because "whitepeoplebuiltthis" the White People of Whiteland get to say who gets in.