There is information on the Internet about the ongoing embarrassment that is our country's current immigration policy:
". . . Racism has blinded many Americans to what takes place in our own kitchens, workshops, and fields. For our nation to be whole, we must acknowledge that our lives of privilege are supported in thousands of ways by people whose labor is invisible and whose suffering is hidden."There are a variety of sources for anyone wanting to stay current with these issues. A glut, almost, of information. Some of it from non-traditional sources, some of it from a religious point of view, some of it from what seem traditional, non-racist points of view, and some from other sources that I prefer not to link to.
—Rev. William G. Sinkford, Unitarian Universalist Association (UUA) President
The Wikipedia entry for Immigration to the United States looks like a good place to get an overall picture.