Border Security: Immigration Enforcement Between Ports of Entry. Congressional Research Service, Library of Congress. Carla N. Argueta. April 19, 2016.
Border enforcement is a core element of the Department of Homeland Security’s effort to control unauthorized migration, with the U.S. Border Patrol (USBP) within the U.S. Customs and Border Protection (CBP) as the lead agency along most of the border. Border enforcement has been an ongoing subject of congressional interest since the 1970s, when unauthorized immigration to the United States first registered as a serious national problem; and border security has received additional attention in the years since the terrorist attacks of 2001.
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