This study is a single site project that is conducted at the University of North Texas Health Science Center. The DFW metroplex currently represents the future racial/ethnic distribution of the U.S. and is a unique setting to simultaneously study factors associated with MCI/AD among African Americans, Hispanics and non-Hispanic Whites. The HABS-HD project is funded by grants from the National Institute on Aging (NIA): R01AG054073, R01AG058533 and U19AG078109. In 2020, UNTHSC provided funding for the addition of 1,000 African Americans to this study. The study has now enrolled over 1,000 Mexican Americans and 1,000 non-Hispanic whites from the community. Enrollment for an additional 1,000 African Americans began in February 2021.