Some really good info if you check out the link. http://www.thewildlifenews.com/2014/...quals-freedom/

Here is just a little.

Constitutional authority

There are those who claim the federal government has no constitutional right to own lands except for a few forts and the District of Columbia as authorized in Article 1, Section 8, Clause 17 of the Constitution. If this was the sum of federal authority, it makes it hard to explain how at the beginning the federal government owned all but the 13 states. Why were not these new territories’ lands instantly given to the citizens, the states, or put up for sale to the highest bidder?

In fact, land acquisition by the United States in North America took place through treaties and purchases, beginning with the Louisiana Purchase in 1803 and ending with the purchase of Alaska in 1867. Through the years, the federal government acquired 1.8 billion acres in North America. The U.S. Constitution addresses this in what is called the Property Clause, not in Article I, section 8, clause 17. The Property Clause (Article IV, section 3, clause 2) reads, “The Congress shall have power to dispose of and make all needful Rules and Regulations respecting the Territory or other Property belonging to the United States; and nothing in this Constitution shall be so construed as to Prejudice any Claims of the United States, or of any particular State.”