This biography introduces young readers to the life of Shoshone Native American Sacagawea. Readers learn about Sacagawea's tribe, childhood, and capture by a Hidatsa tribe. Sacagawea's marriage to French-Canadian fur trapper Toussaint Charbonneau is also covered. Readers discover that Sacagawea traveled with Meriwether Lewis and William Clark, who were leading an exploration to the land west of the Mississippi River, known at that time as the Louisiana Territory, for President Thomas Jefferson. Engaging text explains how Sacagawea helped guide and feed the explorers as they traveled the Missouri, Lemhi, Clearwater, Snake, and Columbia rivers and traversed the Rocky Mountains. A detailed map allows readers to follow this Voyage of Discovery. Full-color photos, an index, a timeline, discussion questions, bold glossary terms, and phonetics accompany easy-to-read text.