After the conclusion of the french and indian war i believe. I hope this helps
The Republican Party stated that slavery would not be allowed to spread any further into the territories
Slavery forbidden in the Northwest Territory. Slavery and involuntary servitude were forbidden in theNorthwest Territory, thereby making the Ohio River a natural dividing line between the free and slave states of the country. Unanimous consent from the states was required for the Northwest Ordinance to be passed.
