What makes the chosen Harriet Tubman different from the traditional norms of the era in which they lived?

What makes the chosen Harriet Tubman different from the traditional norms of the era in which they lived? Use only these sources Walters, Kerry S. Harriet Tubman: a life in American history. 2020 and Schraff, Anne E. The life of Harriet Tubman Moses of the Underground Railroad. 2014.