LSM is a complete and organized visual language, which is expressed with the hands, face, and body, with its own distinct history, community, and culture.
[2] There are several dialects based on regional variation and LSM may be learned as a second language by hearing and Deaf signers.
[3] LSM originated in the mid-19th century following the establishment of the first school for the Deaf in Mexico City, Escuela Nacional de Sordomudos (ENS), in 1869.
There is also a growing number of LSM signers in the United States, particularly in areas along the US-Mexico border and in Washington, D.C., due to educational and economic opportunities.
[5] Before 2005, the major educational philosophy in the country focused on oralism (speech and lipreading) and with few schools that conducted classes in LSM.