Read along and learn about the Lewis and Clark expedition in the next book in the What Was. . . ? series. Filled with facts, illustrations, maps, pictures, and more, this book introduces children ages 9 to 12 years to an important historical event: the Lewis and Clark expedition. Readers will learn more about the Louisiana Purchase, who Meriwether Lewis and William Clark were, the important role that a young Native American woman named Sacajawea played, and so much more. Includes a timeline of the expedition, plus a timeline of world events.