What did Mary Ann Shadd invent?

Mary Ann Shadd was an African American abolitionist, educator, and journalist rather than an inventor in the traditional sense. She is best known for founding the "Provincial Freeman," the first Black newspaper in Canada, and for her advocacy for education and civil rights. Shadd was also a pioneering figure in the fight for women's suffrage and played a significant role in the Underground Railroad. While she didn't invent a specific product, her contributions to journalism and social reform were groundbreaking.