Answer:
The Northwest Ordinance banned the institution of slavery in the Northwest Territories.
Step-by-step explanation:
The northwest ordinance were pushed by the progressive group to outlaw all slavery in United States. They're based on the principles that all humans are equal and none should be forced to give their livelihood under chains and whips.
The northern states argued that the southern states should have no ground to refuse this ordinance. Ever since the industrial revolution, the use of slavery is no longer necessary. They wanted the south to transition to using machinery for their productions rather than another human being.