The Northwest Territory, also known as the Old Northwest and formally known as the Territory Northwest of the River Ohio, was formed from unorganized western territory of the United States after the American Revolution. … See more

The Northwest Ordinance of 1787 established the Northwest Territory, and defined its boundaries, form of government, and administrative structure. In particular, it … See more

• Historic regions of the United States
• Louisiana Purchase, lands west of the Mississippi River
• Ohio Company
• Old Southwest, analogous lands south of the Ohio River See more

• Barr, Daniel P. The Boundaries Between Us: Natives and Newcomers Along the Frontiers of the Old Northwest Territory, 1750–1850 (Kent … See more

Integration of the Northwest Territory into a political unit, and settlement, depended on three factors: relinquishment by the British, extinguishment of states' claims west of the Appalachians, … See more

Forts, garrisons and settlements established in the territory northwest of the River Ohio between 1778 and 1803 (excluding those … See more

Thirteen counties were formed by Governor Arthur St. Clair during the territory's existence:
• Washington County, with its seat at Marietta, was the first county formed in the territory, proclaimed on July 26, 1788, by territorial governor … See more