Sacagawea was only 15 years old when she led the Lewis and Clark expedition into the wilderness of the western United States.Fact-filled Rookie Read-About Biographies introduce the youngest readers to influential women and men, both past and present. Colorful photos and age appropriate text encourage children to read on their own-as they learn about people like Serena Williams, Neil Armstrong, Rosa Parks, Anne Frank and many more. From finding food to easing relations with new people, Sacagawea proved herself to be an incredible help. Without her, the greatest adventure in American history might very well have failed.