Which 1787 law created the United States’ first organized incorporated territory?

The Northwest Ordinance created the United States’ first organized incorporated territory in 1787.

Formally titled “An Ordinance for the Government of the Territory of the United States, North-West of the River Ohio,” it was enacted by the Confederation Congress on July 13, 1787. It established the Northwest Territory in land north of the Ohio River and east of the Mississippi River, including areas that later became several Midwestern states.

The ordinance set out a process for territorial government and eventual statehood. It described stages of administration, allowed a territory to form a legislature after reaching a population threshold, and provided for admission as a state when population and constitutional requirements were met. It also prohibited slavery in the territory, although the provision did not end slavery elsewhere.

The law is often confused with the Land Ordinance of 1785, which focused mainly on surveying and selling western lands. The Northwest Ordinance dealt with governance and state formation. Its framework influenced later territorial policies and helped shape the admission of Ohio, Indiana, Illinois, Michigan, and Wisconsin.