How the United States Immigration System Works

This is not my own post, but it was well researched and written by American Immigration Council.  The article sums up the essence of our immigration system here in the United States.  Since there has been much debate about immigration, in advance of the election, I believe the article provides good information that sets the stage for any intelligent discussion on the issue.

https://www.americanimmigrationcouncil.org/research/how-united-states-immigration-system-works