ANSWER: See the map below.
QUESTION 2: WHY??
ANSWER: Anyone...anybody...HELLLOOOO! (crickets)
FACT THAT SHOULD CONCERN US ALL: The federal government owns or controls more land in the nation that there is east of the Mississippi. That's a great way to, if not totally destroy the states, erase their borders and the STATE sovereignty the Founders attempted to preserve.
What does the Constitution authorize?
Article 1, section 8 Clause 17: "The congress shall have power...to exercise like authority over all places purchased by the consent of the legislature of the state in which the same shall be, for the erection of forts, magazines, arsenals, dock-yards, and other needful buildings;"
Notice that all the structures mentioned are defensive in nature. Have recent federal governments been defending the country -- REALLY defending this place??
That clause has been twisted by decades of liberal congresses and allowed by a quiescent government school indoctrinated public just like they've twisted and we have also allowed, for example, the welfare, interstate commerce and other clauses to sweep into federal control just about every human activity in this formerly free nation.
Several really smart freedom lovers saw this coming 2 centuries ago! "...the natural tendency of things is for government to gain Ground and for liberty to yield...let no more be heard of Confidence in man, but bind him down from mischief by the chains of the constitution." Thomas Jefferson
"(centralized government) will destroy the state government, and swallow the liberties of the people." Patrick Henry
May I be so bold as to suggest that millions do something that would scare the hell out of these ignorant, power-grabbing politicians and petty bureaucrats? That would be to READ and UNDERSTAND the approximately 4,400 words in OUR national charter, the Constitution? It's available FOR FREE ON-LINE EVERYWHERE!
You'd need to explain it to them as most of them NEVER HAVE!!
Oh yeah -- one more thing: While I still support Trump because he's probably the only guy with the cajones to muck that fetid stable on the Potomac, he REALLY NEEDS TO BETTER EXPLAIN HIS SEEMINGLY UNQUALIFIED SUPPORT FOR "EMINENT DOMAIN" which is more and more being applied in an UNJUSTIFIABLE MANNER to enrich connected developers and entities.