Border Security: Immigration Enforcement Between Ports of Entry

This report reviews efforts to combat unauthorized migration across the Southwest border in the nearly three decades since the Immigration Reform and Control Act (IRCA) initiated the modern era in migration control, takes stock of the current state of border security, and considers lessons that may be learned about enhanced enforcement at U.S. borders. The report begins by reviewing the history of border control and the development of a national border control strategy beginning in the 1990s. The following sections summarize appropriations and resources dedicated to border enforcement, indicators of enforcement outcomes, metrics for estimating unauthorized migration flows, and possible secondary and unintended consequences of border enforcement. The report concludes by reviewing the overall costs and benefits of the current approach to migration control and raising additional questions that may help guide the discussion of these issues in the future.,5/