Answer:
a population of 60,000
Step-by-step explanation:
According to the Northwest Ordinance of 1787, a territory could apply for statehood after it had "a population of 60,000."
This is evident in Section 14, Art 5 of the Ordinance which stated among other things that "And, whenever any of the said States shall have sixty thousand free inhabitants therein, such State shall be admitted, by its delegates, into the Congress of the United States, on an equal footing with the original States in all respects whatever, and shall be at liberty to form a permanent constitution and State government..."