Tubman is minor historical figure even in the suffrage movement. There were many many other people involved with the Underground Railroad.
Most of the leading suffragists were white , to be honest.
To be honest, honesty has nothing to do with your post, since suffrage was mainly for voting, not emancipation. I'm sure Tubman was a minor historical figure in the Manhattan Project, too. So what? No one considers Tubman "minor" in any way. You're just spewing slander.
And concerning the Underground Railroad to help slaves escape, she was, as I said, a heroine of enormous courage and faith in God. To try and denigrate that heroism through misdirection puts you on the opposite side of humanity from her. So it's no surprise you can't see her historical value to this country and all of humanity.