The adobe house I grew up in New Mexico had a 22 carved into one of the vigas, and we always thought it was 1922. But in the early-mid 80s two women came to the house. They were born there in 1908 and 1910. They said their father was born there too. They remembered the roof being completely replaced, and the 22 might have been part of that.
Federally protected lands are on the West Coast, a good chunk of all of those states is just either national Parks, national wilderness areas, or BLM lands.
That's exactly what's going on between the Rockies and Sierra Nevada in the Great Basin. But, west of the Sierra Nevada, on the coast, the paradigm changes entirely.