Before the expedition of Meriwether Lewis and William Clark, the United States stopped at the Mississippi River. However, their journey opened up the wilderness borders to the Pacific Ocean. The key to the success of this 18 month journey was a young Indian girl - Sacajawea. Without her, the corps of discovery would have been doomed from the start. This vital piece of America's history - the Corps of Discovery's expedition of the exploration of the west - is an authentic and moving listen for both YA and adults by award-winning author Joseph Bruchac.