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).
Book discussion club. A book club is a group of people who meet to discuss a book or books that they have read and express their opinions, likes, dislikes, etc. It is more often called simply a book club, a term that is also used to describe a book sales club, which can cause confusion. Other frequently used terms to describe a book discussion club include reading group, book group, and book discussion group.