The citizens of the metroplex would be happy to secede -- if they could join British Columbia and become part of Canada. A referendum on that topic in the metroplex would easily draw 60% in favor of a Canadian annexation.
But Washington is not threatening secession.
Ah yes... The Hamilton Signs... For many years the source of much fun and wonder when driving by on the freeway. Always something new. Back in the old days it was mostly Bircher stuff, anti-UN and such. But just to be clear... While I agreed generally with his signs, old man Hamilton was a nut job. I had the honor of having him personally threaten me with a shotgun once, when I was a kid. Probably a good guy in lots of ways but the dude had a really short fuse and turned into a frothing vein-popping foul mouthed redneck in an instant. :-)