Lewis and Clark: forever paired for their epochal first crossing of the continent in 1804-1806, darlings of the young republic, and the pride of Thomas Jefferson because they made his dream of a nation between two oceans come true. Plain-spoken William Clark, enjoys the triumphs and acclaim of the expedition, marries his childhood sweetheart, and settles in St. Louis as superintendent of the nation's Indian affairs. His black manservant, York, who...