The names Lewis and Clark have been branded into history, along with Sacagawea, the Shoshone woman who helped guide their expedition across the uncharted American continent. How about York? Remember him? If not, you're not alone. York was a slave - the property of Capt. William Clark. Now a group of historians says York has not been given the attention he deserves for his role in the Corps of Discovery's journey across America. They want to rectify that as the bicentennial of the 1803-1806 journey nears. Scholars scheduled a conference in Por ....