This biography introduces young readers to the lives of Meriwether Lewis and William Clark. The book discusses each man's childhood, education, and army service. Readers learn that President Thomas Jefferson hired Lewis and Clark to lead an exploration to the Louisiana Territory. Readers discover that Sacagawea joined the expedition and that Lewis and Clark benefited from the help of many Native American tribes such as the Mandan, Hidatsa, and Nez Perce tribes. A detailed map allows readers to follow along this Voyage of Discovery. Lewis and Clark made their way along the Missouri River from St. Louis, Missouri, to Montana. They eventually reached the Pacific Ocean via the Clearwater, Snake, and Columbia rivers. Readers learn that Lewis and Clark's expedition led to settlement of the West. Also explained through engaging text is the lives of Lewis and Clark following the expedition. Full-color photos, an index, a timeline, discussion questions, bold glossary terms, and phonetics accompany easy-to-read text.