To realize their vision, the founders created a distinct political category for the frontier: territory. The revolution had been fought by a union of states, but those states’ borders became ill-defined and even overlapped as they reached westward. Rather than dividing the frontier among the states, the republic’s leaders brokered deals by which none of the Atlantic states would extend to the Mississippi, which marked the western edge of the country. Instead, western land would go to the federal government. It would be administered not as states, but as territories.
