Oprah rejoices as Harriet Tubman selected to be on $20 bill
Born a slave, Tubman went on to lead the Underground Railroad, a secret network of safe houses where slaves were helped to escape to free states.
The media mogul made the comments promoting her latest OWN network show at the Tribeca Film Festival in New York.
Winfrey serves as executive producer and also appears in the series about a journalist who returns home to her estranged family in the South.