How did the Northwest Ordinance increase sectionalism in the United States?. A-It put the territory under one government ... B-It ensured religious freedom ... C-It laid out a way for territories to become states ... D-It made slavery illegal.

C-It laid out a way for territories to become states

The Northwest Ordinance of 1787 overturned the colonial idea that newly settled lands would be subservient to established areas. It also established the format for American land policy for years to come, and he law provided the first national limitation upon the expansion of slavery.