WASHINGTON, DC (WUSA)-- Jackson Davis V is a 6th grader on a mission.
He wants the world to honor York, William Clark's slave.
Jackson says so much is known about the Lewis and Clark expedition but York's contribution was undervalued.
Jackson wrote the United States Postal Service Citizens' Stamp Advisory Committee to ask them to honor York on a Heritage stamp.
Young Jackson Davis V joined 9NEWS NOW's Mike Hydeck to get others to support his efforts.
You can like York's facebook page or you can by York Bracelets to show your support.