20 dollar bill

What struck me about the Treasury's announcement is the role of social activism in prompting the redesign and the Treasury's decisions to feature social and political activists on American banknotes for the first time.
A Smithsonian curator notes how a heavy dose of social activism prompted the U.S. Treasury to honor historic social and political movements
We have to wait until 2020 (isn't that the same year, the raised minimum wage will actually start?) at which point paper money will be so rare and exotic that the significance of Harriet Tubman will probably remain as unknown as she is now to a lot of young people.
The North was overwhelmingly against slavery and opposed its spread to the West, but did not favor ending slavery in the South by force. The Underground Railroad changed that.