The said territory, and the States which may be formed therein, shall forever remain a part of this Confederacy of the United States of America, subject to the Articles of Confederation, and to such alterations therein as shall be constitutionally made; and to all the acts and ordinances of the United States in Congress assembled, conformable thereto. The inhabitants and settlers in the said territory shall be subject to pay a part of the federal debts contracted or to be contracted, and a proportional part of the expenses of government, to be apportioned on them by Congress according to the same common rule and measure by which apportionments thereof shall be made on the other States. Source:
Article 4, the Northwest Ordinance