York, a slave whom William Clark inherited from his father, was the first African American to cross North America. York came to Jefferson County, KY, with Clark to live on the family plantation, Mulberry Hill. In 1803 York accompanied Clark on the Lewis and Clark Expedition (1803-1806); he was known as Big Medicine to the Indians. A while after the expedition, York was freed; the date and place of his death is not known. For more see In Search of York by R. Betts; The Encyclopedia of Louisville, ed. by J. E. Kleber; and Buffalo Dance, the journey of York, by F. X. Walker.