Maybe they're lost Parenti footage?

New Mexico is, in fact, leftover space from Mages doing Correspondence magic, making their own pocket dimensions. These mages eventually move on to their own Horizon Realms or die and their magick leftovers accumulate. Over time, this inflates the surface area of the planet. The locus of this effect is in New Mexico.

Because Mexico already exists. Why would we need a new one, silly?

I need a deep dive on the implications of this theory for the genesis of Blighttown

I watched breaking bad on a monitor with the colour settings set to 'ice cool blue' so i didn't realise they were in new mexico until someone told me 'hey, you know they're in new mexico, right'. Ruined the show for me