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.
Sierraville is an unincorporated community in Sierra County, California, United States. It is at the western end of the huge Sierra Valley which is used primarily as pasture and is also at the junction of California State Route 49 and California State Route 89 southwest of Loyalton. Sierraville has a post office with ZIP code 96126. The post office opened under the name Sierra Valley in 1862 and became known as the Sierraville post office in 1899.