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).
Statistics on existing fencing (as of 2016): By 2012 about 300 miles of pedestrian fencing and 250 miles of vehicle barriers had been installed on the 1989 mile long US-Mexico border. Update (Dec. '18):
By end of 2017, 700 miles of wall and fencing.
Pictures: from National Geographic (2016)
Dispatches from the US-Mexico border (NPR, 2018)
Biggs' funding bill (introduced, August 2018)
Fenced stretches per Washington Post (26-Jan-17)
Fenced stretches per New York Times (26-Jan-17)
This page last updated 12 January, 2019