From America's leading immigration economist, a refreshingly level-headed exploration of the effects of immigration on migrant and nonmigrant workers.

In the 1970s the Mexican government acted to alleviate rural unemployment by supporting the migration of able-bodied men. Millions crossed into the United States to find work that would help them survive as well as sustain their families in Mexico. They took low-level positions that few Americans wanted and sent money back to communities that depended on their support. But as U.S. authorities pursued more aggressive anti-immigrant measures, migrants...