For those who actually want to know a bit more about the current immigration debate, including statistics, history, etc., here are some actual informative posts that you should read up on:
From Migration Policy: Frequently Requested Statistics on Immigrants and Immigration in the United States.
From the Department of Homeland Security: Yearbook of Immigration Statistics.
Here is just one of the DHS documents from that site:
From ProCon: History of Immigration to the United States.
From the Center for American Progress: The Facts on Immigration Today.
Pew Research: Immigration page.