Final answer:
The Northwest Ordinance required a territory to have a population of 60,000 free inhabitants in order to become a state.
Step-by-step explanation:
One requirement for a territory to become a state according to the Northwest Ordinance was the territory's population of free inhabitants reaching 60,000. This requirement ensured that the territory had a sufficient number of residents to support a functioning state government. It also helped to ensure that the territory was capable of providing for its own defense and maintaining law and order.
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