Scholastic
Scholastic: Immigration
Scholastic gives a detailed look at immigration to the United States from the 17th century to the present. Includes motivation for immigration and immigration restrictions and laws.
PBS
Pbs News Hour Extra: Changing Immigration Policy
This PBS site takes a look at the changing immigration policy since 9/11. Addresses issues such as the Patriot Act, problems with the immigration system, and attracting international students.
Other
Us Citizenship: u.s. Immigration Made Easy
Gives up-to-date information on immigration. Guides you through the process of becoming a U.S. Citizen, allows you to take a practice test, find out the cost, and even file your application online.