

Army soldiers along the southwest border performed intermittent border patrolling, but this was secondary to "the more serious work of military training". These patrolmen were immigration inspectors, assigned to inspection stations, and could not watch the border at all times. Although these inspectors had broader arrest authority, they still largely pursued Chinese aliens trying to avoid the National Origins Act and Chinese Exclusion Act of 1882. Most rode on horseback, but a few operated automobiles, motorcycles, and boats. In March 1915, Congress authorized a separate group of mounted guards, often referred to as "mounted inspectors". Though they never totaled more than 75, they patrolled as far west as California trying to restrict the flow of illegal Chinese immigration. The inspectors, usually called "mounted guards", operated out of El Paso, Texas. Mounted watchmen of the United States Department of Commerce and Labor patrolled the border in an effort to prevent illegal crossings as early as 1904, but their efforts were irregular and undertaken only when resources permitted. The first legislation restricting immigration, after the Act Prohibiting Importation of Slaves of 1807, was the Chinese Exclusion Act of 1882. In the nineteenth century, United States borders were open and unrestricted there was no systematic control or even recordkeeping of immigrants. 16.6 Incidents involving use of tear gas and pepper spray.16.5 Death of José Antonio Elena Rodríguez.16.3 Death of Anastasio Hernández-Rojas.


With 19,648 agents in 2019, the Border Patrol is one of the largest law enforcement agencies in the United States. According to its web site in 2022, its mission is to "Protect the American people, safeguard our borders, and enhance the nation’s economic prosperity." The United States Border Patrol ( USBP) is a federal law enforcement agency under the United States' Customs and Border Protection and is responsible for securing the borders of the United States.
