The immediate problem would be that Idaho, eastern OR and eastern WA are _very very seriously_ trying to do the whole Greater Idaho thing, and are basically chalk full of armed white supremacist theocrat bigots. So... yeah. I guess the 'good' news is that western WA has JBLM and a lot of Navy bases, and maybe enough of them would align with Cascadia ... ? The bad news is the Holy State of Greater Idaho would probably be able to dash and seize Hanford, and then be able to make dirty nuclear bombs. But anyway... Throw in Hawaii and then Cascadia and Japan and SK can form a trading bloc, and theoretically be able to back that up with maybe a little bit of the formerly US Navy? Total spitballing here. Alaska sure would be completely fucked. Airline fuel is pretty expensive these days... for **_some_** reason... Didn't BC/Yukon already basically say 'fuck you' to US truckers going between Alaksa and the 48, or I am not remembering that right?