Border security in the United States

In the United States, border security includes the protection of ports, airports, and the country's 3,017-mile (4,855 km) land border with Canada and 1,933-mile (3,111 km) border with Mexico. The U.S. concept of border security is deeply entwined with the persistent actual or perceived threat of terrorism, as well as more universal concerns such as immigration control, smuggling, and human trafficking. As such, the U.S. federal government is constantly reevaluating and adjusting its border security policies to reflect the perceived threats posed to the United States.