Best Answer: St. Augustine (Florida) is the oldest continually occupied European settlement in the continental United States, only San Juan, Puerto Rico predates the city as the oldest settlement within the territory of the United States.
Finally in 1980 the American Psychiatric Association officially recognized multiple personality disorder as a genuine emotional illness. Today, MPD is a relatively popular diagnosis with 20,000 cases recorded between 1980 and 1990. Researchers currently believe that from 0.01-10% of the general population has this mental illness.
During a year of screening DNA samples from more than 400 families with bipolar disorder, the study's first author, Thomas B. Barrett, M.D., Ph.D., assistant professor of psychiatry, UCSD and psychiatrist, San Diego VA Healthcare System, determined that there were six mutations in the promoter region of the GRK3 gene.