Ann Coulter in her new book describes illegals inhabiting our national parks to grow their marijuana. There are also missing people and unsolved murders taking place in the national parks.
So, wolves, illegals ... we got a problem Houston.
While Ann is correct, while backpacking I can recall being warned off certain trails, or warned not to stray off them, for that reason. In the far west and Hawaii. When Ann was in elementary school. Big problem, but not new and I doubt, at least in those days, an issue of illegals.
On the other hand, I can think of large tracts of the southwest, including National Monuments, which are unhikeable (I made up that word) today today and for the last decade because of illegals, illegal drug dealer caravans.
Same result in the end. Guess we've lost parts of our nation.