Public Domain (Wikipedia)
On 23 September 1806, and amid much public excitement, the expedition of William Clark and Meriweather Lewis returned to St. Louis, Missouri. They were the first to record an overland journey from the Mississippi River to the Pacific coast and back. They had set out two years ago and came back with a wealth of knowledge about the territory of the newly purchased Louisiana Purchase. Under President Jefferson, the United States purchased the Louisiana Territory in 1803 for a price of 3 cents per acre for some 828,000 square miles of land. It is considered one of the best land deals ever. Jefferson commissioned the expedition of Lewis and Clarke to explore this territory and report back what they found.
The expedition left in May 1804 with about four dozen men and equipment. Traveling up the Missouri River in six canoes and two longboats they would winter in Dakota before crossing into Montana where they saw the Rocky Mountains for the first time. They would meet the Shoshone Indians on the other side of the Continental Divide, who would sell them horses. The journeyed through the Bitterroot Mountains, down the rapids of the Clearwater and Snake rivers, until they reached the Columbia River and to the sea. They arrived at the Pacific Ocean on 8 November 1805 and were the first European explorers to do this overland from the east.
They paused for the winter and then made their journey back to St. Louis in the spring. The journals that were kept noted longitude and latitude with detailed notes on soil, climate, animals, plants, and native peoples. They identified new plants and animals (the grizzly bear for one). They also named geographic locations after themselves, loved ones, friends and even their dog. They experienced a variety of diseases and injuries during their journey but only one person perished. Their expedition is considered one of the most consequential and remarkable in U.S. history. Their travels in Oregon would lead the U.S. to able claim territorial rights later.
Sources
Buckley, Jay H. “Lewis and Clark Expedition | Summary, History, Members, Facts, & Map.” Encyclopedia Britannica. Last modified July 31, 2024. https://www.britannica.com/event/Lewis-and-Clark-Expedition.
———. “Lewis and Clark Return to St. Louis.” HISTORY, September 21, 2020. https://www.history.com/this-day-in-history/lewis-and-clark-return.
———. “Louisiana Purchase | Definition, Date, Cost, History, Map, States, Significance, & Facts.” Encyclopedia Britannica. Last modified July 30, 2024. https://www.britannica.com/event/Louisiana-Purchase.