One of the most important legacies of the northwest ordinance was that it prevented the expansion of north of the ohio river in the new territories.
a)
slavery
b)
indian warfare
c)
industrialization
d)
british colonization

I think the correct answer from the choices listed above is option A. One of the most important legacies of the Northwest Ordinance was that it prevented the expansion of slavery in the north of the Ohio River in the newterritories. Hope this answers the question.