US has land borders with Canada and Mexico, maritime borders with Russia. US maritime borders with Canada are partially disputed. US claims disputed territories on three Caribbean islands. US Minor Outlying Islands are mostly uninhabited and unincorporated
Founded in 1839 as Asâkir-i Zaptiye, evolved from Ottoman military law enforcement. Currently has 3,600 units, including 3,056 Internal Security Units. Operates under Ministry of Interior, with headquarters in Ankara. Jurisdiction covers 93% of Turkey's territory, serving 20% of population
Ministry of Interior manages interior security in Turkey. Current Minister is Ali Yerlikaya. Ministry consists of multiple command structures
US has highest number of immigrants worldwide with 50.6 million in 2019. Immigration patterns changed significantly between 1921-1965 with quotas. First-generation immigrants quadrupled from 9.6 to 38.1 million between 1970-2007
Border checkpoints inspect travelers and goods for passage authorization. Authorization often required to enter countries through borders. Checkpoints prevent undesirable individuals and illegal goods. Uniformed service staffed at checkpoints
Established in 2003 after 9/11 attacks to consolidate federal homeland security agencies. Headed by Secretary with Deputy Secretary, overseeing 240,000 employees. Incorporated 22 agencies into single organization