The Corps of Discovery refers to the military unit that took a two year expedition with Lewis and Clark in order to explore the land recently bought by the US government from France. This territory became known as the Louisiana Purchase.
When exploring with Lewis and Clark, the Corps of Discovery went through several different states that exist today. This includes Kansas, Nebraska, Montana, Idaho, and Washington. Essentially, this route went from Missouri to the Pacific Ocean in Washington, covering the middle of the continental US all the way to the Northwest corner of the US.
