I think Nevada is in the 80% range owned by the federal government.
Whatever the Federal government doesn't own, the state does-including the land your house is on. Even if your mortgage is paid off, you still have to pay property taxes (rent) to the state. If you don't pay, they will foreclose(evict you). Owning your own home in the US is a myth these days.
Yup. The only sure things are death and taxes.