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).
Sierra is a Spanish word meaning  saw . The corresponding word in Portuguese, Catalan and Latin is serra.This name is used for various mountain ranges in Spanish-speaking and other countries (with the word serra used in Portuguese-speaking countries).Sierra or Sierras may refer to:ierra is a Spanish word meaning  saw . The corresponding word in Portuguese, Catalan and Latin is serra.