Harriet Tubman

The latest measure, sponsored by Sen. Jeanne Shaheen, a Democrat from New Hampshire, follows years of delays and efforts to have Harriet Tubman replace President Andrew Jackson on the $20 bill.

Revered abolitionist Harriet Tubman, who was the first woman to oversee an American military action during a time of war, was posthumously awarded the rank of general on Monday.

Author Clarence Lusane says people can learn a lot from Tubman's lifelong struggle to open the doors of our democracy.