The city of Houston has significant populations of Mexican Americans, Mexican immigrants, and Mexican citizen expatriates. Houston residents of Mexican origin make up the oldest Hispanic ethnic group in Houston, and Jessi Elana Aaron and José Esteban Hernández, authors of "Quantitative evidence for contact-induced accommodation: Shifts in /s/ reduction patterns in Salvadoran Spanish in Houston," referring to another large Latino group in Houston, stated that as of 2007 it was the most "well-established" Hispanophone ethnic group there. Houston is the third city for Mexican immigrants after Chicago and Los Angeles.
