What actions prompted the border control offensive and made the issue of illegal immigration a priority?

Homeland Security- Examine The Economic Impact Of Border Protection.

1) What actions prompted the border control offensive and made the issue of illegal immigration a priority?

2) Who is the enemy? From what or whom are we protecting the border? Is the enemy more than terrorism and terrorists?

3) What is the connection between border enforcement and public health and Safety concerns?

Your initial post should be at least 350 words and reference Chapter 5 from :Andreas, Peter. Border Games; Policing the U.S.-Mexico Divide, Second Edition. Cornell University Press, 2009