Premise: Mary Eliza Mahoney (May 7, 1845 – January 4, 1926) was the first African American to study and work as a professionally trained nurse in the United States, graduating in 1879. Mahoney was one of the first African Americans to graduate from a nursing school, and she prospered in a predominantly white society. She also challenged discrimination against African Americans in nursing.
Hypothesis: Mahoney started her career in nursing in 1879.