You don't have to enforce integration. You have to enforce the ability to integrate. That means you do not get to come to this country if you don't speak English. Maybe some asylum exceptions, but nothing beyond that. You cannot integrate if you cannot communicate with the people with which you are supposed to integrate. And before anybody gets all high and mighty, my mother was born in Cuba, so I'm pretty familiar with immigrants who refuse to learn the language. My great-grandmother never integrated because she never took the time. And that was back in the '60s when you couldn't move to a state that has entire communities of ethnically homogenous immigrants forming miniature versions of their home countries. But the real answer is, immigration probably just needs to stop. Give it about 20 to 30 years, everyone will be integrated, and we can start the machine back up again