Immigration law determines whether a person is an alien, the rights, duties, and obligations associated with being an alien in the United States, and how aliens gain residence or citizenship within the United States. It also provides the means by which certain aliens can become legally naturalized citizens with full rights of citizenship. Immigration law serves as a gatekeeper for the border of the nation, determining who may enter, how long they may stay, and when they must leave. Immigration lawyers represent persons seeking temporary and permanent residency (green cards) status in the U.S., those interested in obtaining U.S. citizenship through a process called naturalization, and clients facing deportation and removal. Immigration attorneys may also represent businesses seeking to secure temporary visa status for foreign employees.
San Luis is a city in Yuma County, Arizona, United States. The population was 15,322 at the 2000 census. It is part of the Yuma Metropolitan Statistical Area. San Luis was the second fastest-growing place among all cities and towns in Arizona of any size from 1990 and 2000. According to 2006 Census Bureau estimates, the population of the city is 22,634.