Like Kay Steiger, I do love it when I can post a graph to prove my points. And so I'm going to steal the one she found! You occasionally hear conservatives argue that the problems of the uninsured in this country are entirely due to immigration. No immigrants, no increases in the uninsured. I've shot this point up before, but EPI helpfully graphed the debate, showing what would have happened to the population of the uninsured had immigration been frozen in 2000.
As you can see, freeze immigration and the 2.1% increase in the uninsured population becomes a...1.9% increase in the uninsured population. Which equals out to 5.7 million more Americans uninsured.