Alexander came from a family of academic achievers—her father and uncle both graduated from the University of Pennsylvania, studying law and medicine respectively. Alexander also earned a degree from the school—becoming one of the first African-American women with a PhD in the US—and moved on to Penn’s law school, where she was the first African-American woman graduate. She also served as the first national president of the Delta Sigma Theta sorority. In which subject was Alexander’s PhD? Discuss