In the early 1800s, William Clark and Meriwether Lewis set out, at the request of President Thomas Jefferson, to explore the Louisiana Territory.  For two years, four months, and nine days the men and their crew traveled the rivers, plains, and forests of the west, discovering unknown plants and animals and making contact with many native tribes. This simple introduction to their epic journey is perfect for young readers, featuring large-format illustrations, a timeline of important events, and an afterword that describes the lives of the explorers after their return home.