The Lewis and Clark Expedition officially begins as the Corps of Discovery departs from St. Charles, Missouri.

The Lewis and Clark Expedition was an important journey ordered by U.S. President Thomas Jefferson shortly after the Louisiana Purchase in 1803. Jefferson wanted to explore the newly acquired western territory and learn more about its geography, plants, animals, and Native American tribes. He chose Meriwether Lewis and William Clark to lead the expedition. Beginning in 1804, the group, known as the Corps of Discovery, traveled from St. Louis and moved westward across rivers, plains, and mountains toward the Pacific Ocean.

During the journey, Lewis and Clark faced many challenges, including harsh weather, dangerous rivers, hunger, and difficult mountain crossings. Along the way, they met and traded with several Native American nations, who often helped guide them and provided food and information about the land. One of the most important members of the expedition was Sacagawea, a Shoshone woman who acted as an interpreter and guide. Her knowledge of the region and ability to communicate with tribes greatly increased the expedition’s chances of success.

The expedition lasted more than two years and returned in 1806 after traveling over 8,000 miles. Lewis and Clark brought back detailed maps, scientific observations, and descriptions of hundreds of plants and animals previously unknown to Americans in the East. Their reports helped the United States expand westward and encouraged future settlers and traders to move into the region. Today, the Lewis and Clark Expedition is remembered as one of the most significant explorations in American history.