Let's think about this for a few moments.
A
quick Google search tells me that the US Government owns 650 million acres, which is 28% of the land in the US. Thus, the US Government owns over a quarter of all land in the US. That's a staggering number.
The US Government could sell half of all the land it owns, and still own one eighth of all the land in the US. That's still a huge number.
A look at the map tells it all - most of the federal land is out west and in Alaska; Nearly all of Nevada seems to be owned by the federal government. (Which makes perfect sense if you've ever driven from Reno, California, to Las Vegas, Nevada.)
Assuming we could get a decent price for some of that land, let's sell it. We can pay down the national debt. Win win.