US-Mexico Border Barriers
1848 Treaty of Guadalupe-Hidalgo specifying border line
1924 US Border Patrol
1986 Immigration Reform and Control Act (US)
1994 Operation Gatekeeper (Calif. + similar border tightening by US
borders in Arizona and Texas from 1983-97)
1996 Illegal Immigration Reform and Responsibility Act (IIRAIRA) (US)
2006 Secure Fence Act (US)
Total US Border Patrol budget (billions): 1991 $.3, 2000 $1, 2016 $2.6.
US-Mexico border (fiscal 2016): 86% of agents, 98% of apprehensions (of which about 1/2 were nationals of Mexico, about 1/4 from the "Northern Triangle" (Honduras, Guatemala, El Salvador) and 1/4 other).
Pictures: from National Geographic (2016)
Fenced stretches per Washington Post (26-Jan-17)
Fenced stretches per New York Times (26-Jan-17)
This page last updated 26-January, 2017