Final answer:
Dr. Solomon Carter Fuller was the first Black psychiatrist and graduated in 1897 from the Boston University School of Medicine. His work included the first major study of Alzheimer's disease in the US.
Step-by-step explanation:
The first Black psychiatrist in the United States was Dr. Solomon Carter Fuller, who graduated from the Boston University School of Medicine in 1897. Dr. Fuller's significant contributions include working at Westborough State Hospital, being a faculty member at his alma mater, and publishing the first major study of Alzheimer's disease in the US, following his work with Dr. Alois Alzheimer. Other notable Black doctors from the same era include Dr. Louis T. Wright, who developed the intradermal injection for smallpox vaccination, and Dr. Charles Drew, who created new blood storage and transportation techniques.