Migration at the U.S.-Mexico Border: A Challenge Decades in the Making

Unauthorized migration at the U.S.-Mexico border has been a high-profile and politically divisive issue for decades. But as the nature of migration at the border has changed profoundly, U.S. policy responses have struggled to keep up. This report explores the changing nature of migration flows and migration policy at the border from the early 1990s until today, highlighting key lessons for contemporary policy-making.