In most instances, when you find you have taken a wrong path and things are going badly, the best course of action is to retrace your steps, find out where things began going wrong and the problem began developing, and get back on the correct track that had been working.
This is what we should do.
Before that paragon of wisdom and character Teddy Kennedy and his cohorts changed our immigration laws in 1965, this country's immigration policies worked to improve our society.
All illegals out of the USA!
It is not the solution, but it is a place to start.
I should add, that repeal of the many anti-constitutional gun laws now on the books, where anyone and everyone no matter where they were, could be in charge of and responsible for their own protection, would go a long way toward adding to peace and security within our borders. Had anyone on those hijacked airplanes, been armed, with something besides brains, and physical strength, none of the planes would have reach their objective, and we wouldn't now be mourning the loss of 5,400 plus dead, and 5,000 plus wounded including our national pride. Stupidity reaps its own rewards.