Poland once had Chopin on a banknote. Israel did the same with Einstein. I like that approach -- celebrating all sorts of human achievement. Why restrict the list to bigwigs in governance?
There's a side of me that likes the choice of Harriet because, on a Firing Line show from the 70s, when her name came up, it was a surprise to William F. Buckley -- he had never heard of her! So, by all means, let's celebrate an audacious woman who brought people to freedom. Teachable moment.
And it's time to signal the sea change that James Baldwin noted in 1955: "The world is white no longer, and it will never be white again." Recognition for Harriet Tubman is a celebratory, as opposed to vindictive, way to echo that.