Article IV. 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... 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...
What is the main idea behind Article 4?