Anna J. Cooper
In 1925, at the age of 67, Cooper earned her Ph.D. Her doctoral thesis was: L'Attitude de la France à L'égard de l'Esclavage pendant La Révolution (Slavery and the French and Haitian Revolutionists). Her writing showed that slavery and bad treatment of Black peoples were a big part of revolutions in the France and Haiti. She was the fourth Black American woman to reach that level.