Skip to main content

This version of the website was created in 2025. See the Site Information Page for contact information, data downloads, and other details.

Envisaging the West: Thomas Jefferson and the Roots of Lewis and Clark

Archive

Place Name

Great Miami River

Northwest Ordinance, July 13 1787. Setting the stage for western expansion, the Northwest Ordinance of 1787 shaped the development of the territory north and west of the Ohio River.

Thomas Jefferson to George Washington, March 10, 1793 In his official capacity as Secretary of State, Thomas Jefferson writes to George Washington, reiterating the boundaries of the western frontiers of the United States, particularly as they apply to treaties with Native groups.