Indian peace medals refer to ovular or circular medals awarded to tribal leaders throughout colonial America and early United States history, primarily made of silver or brass and ranging in diameter from about one to six inches. Medals were often perforated and worn suspended around the neck of the recipient. Controversy remains surrounding the use and impact of peace medals in furthering diplomatic relationships between Native Americans and the federal government. Many Indian peace medals today are archived in museums, libraries, and cultural centers.

The Lewis and Clark Expedition, also known as the Corps of Discovery Expedition, was the United States expedition to cross the newly acquired western portion of the country after the Louisiana Purchase. The Corps of Discovery was a select group of U.S. Army and civilian volunteers under the command of Captain Meriwether Lewis and his close friend Second Lieutenant William Clark. Clark, along with 30 others, set out from Camp Dubois, Illinois, on May 14, 1804, met Lewis and ten other members of the group in St. Charles, Missouri, then went up the Missouri River. The expedition crossed the Continental Divide of the Americas near the Lemhi Pass, eventually coming to the Columbia River, and the Pacific Ocean in 1805. The return voyage began on March 23, 1806, at Fort Clatsop, Oregon, ending six months later on September 23 of that year.