Yes, integration has become a real problem lately... You can’t overflow America with millions a year (from any country) and expect them to become part of America. They do not have the time or incentive to learn English or enjoy the merits of being American. Seems that is why immigration was controlled in the first place...
Because America, what she really is about (or was in the past) means absolutely nothing to them. We just happen to be a handy close-by first-world nation, easily accessible, all they have to do is jump the border to be here. We have always been compassionate to those who came in the past. But those who came in the past had to really want to be here. They had to make sacrifices, say goodbye to all they’d ever known. They saw America as more than an free ride. The parasites from Mexico just see an available host, with no concern as to how soon they kill it. They make no sacrifice to come here, they don’t go through inspectiom at Ellis Island to make sure they aren’t criminals, health risks, etc. They don’t save and scrimp to get money for boat passage, leaving all they ever knew, probably never to see it again. They’re not “all in” and for the long haul, like the immigrants of the Great Migration period.
We attract what we get, through our policies. When we attracted people who came here to work, contribute, and become Americans, that’s what we got. Now we have policies attractive to those who want to freeload while demanding their “rights”, so that’s what we get. If they shared a border with, for instance Canada or Australia, it’d be the same. The nation as an ideal means nothing, it’s about an easy host for these ticks and fleas. (And that’s almost literal, they are bringing not only diseases we’d wiped out decades ago, but ones we never had, not to mention terrible parasites).