I think there was some kind of levy they had to pay, but definitely not a complete ban. I don’t think it stuck.

Non-zero? How about 100%? Every single person I’ve ever spoken with about this idea in my life has been on board. I bet 85-90% of the public would support it if the facts could be communicated to them without interference (so, never)

Cascadia would be insanely powerful and competitive on the world stage, probably a superpower.