In an original study conducted in 1965, Leo Grebler, Joan Moore, and Ralph Guzman surveyed Mexican Americans in San Antonio, Texas, and Los Angeles, California. The 1st survey provided a rich cross-sectional view of this population's demographics and attitudes, Ortiz and Telles' 35 year follow-up now allows for a longitudinal view of the behavior and ethnic identification of 1st- through 4th-generation Mexican Americans in these areas. The new survey was used to test hypotheses related to Mexican Americans' social mobility, their ethnic identity and behavior, their experiences with discrimination, and the relationship between socioeconomic status and ethnic identity. Data includes birth dates, citizenship information, education, income, housing, language, medical, religious affiliations, immediate and extended family demographic information, and self perception in regards to ethnicity.