an African-American slave best known for his participation with the Lewis and Clark Expedition. Enslaved by William Clark's father and passed down through a will to William Clark, he performed hard manual labor without pay, but participated as a full member of the expedition. Like many other expedition members, his ultimate fate is unclear. There is evidence that after the expedition's return, Clark had difficulty compelling York to resume his former status, and York may have later escaped or been freed, but nothing is entirely clear on this.
