How did the us acquire the land in the northwest territory

The north west territory encompassed the area west of Pennsylvania, east of Mississippi River, and the north of the Ohio River to border with the British Canada.

NORTHWEST TERRITORY. Part of the vast domain ceded by Great Britain to the United States in the Treaty of Paris (1783), the Northwest Territory encompassed the area west of Pennsylvania, east of the Mississippi River, and north of the Ohio River to the border with British Canada.