The Mara Salvatrucha gang originated in Los Angeles, set up in the 1980s by Salvadoran immigrants in the city's Pico-Union neighborhood who immigrated to the United States after the Central American civil wars of the 1980s.
Definition. The Sierra Club is the oldest grassroots environmental organization in the United States. The organization was founded in 1872 by a San Francisco group of professors, businessmen, and other professionals led by John Muir (Cohen 1985, 10).
The Rotary Club is the basic unit of Rotary activity, and each club determines its own membership. Clubs originally were limited to a single club per city, municipality, or town, but Rotary International has encouraged the formation of one or more additional clubs in the largest cities when practical.