The village of Ste. Genevieve was originally included in the Illinois Country. This was generally accepted to be all the land claimed by the French from the mouth of the Ohio River, north to the Great Lakes, and including the valleys of the Mississippi, Missouri, and Ohio Rivers. The seat of government was established in New Orleans, and what is now Missouri became part of Upper Louisiana Territory. The early French explorers and settlers were known to have been in the Ste. Genevieve area in the very early 18th century.