Comment on article:
The term "United States" was used by our founders to designate the federal government. The key phrase is "territory or other property belonging to the United States," as opposed to the designation "the several states." So, the Article in question says basically that the feds can only control the property they are allowed to own, and that is restricted to DC, military installations, offices...whatever is designated in the Constitution. Since the states are sovereign, this would NOT include land in the "several states."