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).
A travel club is an organization that plans group tours to various destinations around the world. In many cases a travel club caters to a certain kind of traveler. There are, for example, travel clubs for women, clubs for people who have a limited budget, and those for senior citizens. There are also clubs for singles and clubs for families.