Migration and drug smuggling problem has affected most border towns . Many people make a living by catering migrants or working as " coyote " guides . People hoping to cross the border and those recently deported crowd the border area ; some of these people return home , but many others decide to stay on the Sonoran border , working to earn money for another attempt . These workers put a strain on insufficient municipal medical services . The walls , which have shut down much of the illegal crossing into Texas and California , have also been built on parts of the Arizona border , especially between towns such as the two Nacos and the two Nogaleses . The wall in Naco is four meters high and made of steel . It currently extends , but there are plans to extend it another . Security there was further tightened after the 2001 September 11 attacks . The U.S. Border Patrol credits the wall and better surveillance technology with cutting the number of captured border crossers near Naco by half in 2006 . People on both sides of the wall have mixed feelings about it
September 11 attacks
September 11 attacks
Sonora