The main purpose of the book is to describe the two linguistic-cultural phenomena arising from mass emigration of Mexicans to Los Angeles: Spanish-English bilingualism and Spanglish. The main thesis of the research is the correlation between Spanish-English bilingualism and Spanglish. As public opinion deemed Spanglish as a blocker for linguistic advancement or degraded Spanish, it is actually a method of enhancing the linguistic system. That is why, not only does the research contest the use of such terms, but it also argues that bilingualism is a much more compound and adequate term as well as an analytic framework for the study of bilingual productions. Spanglish should be understood as a form of bilingualism, a hybrid enriching the linguistic system.