Don't forget Numbers that the Pacific Northwest would have the American drive, which means that with no communications and very little ways to effectively transport anything, they would be able to easily re-establish the lumber industry and then easily establish a ship building industry followed by finding a shipping crew despite the fact that they're running out of food, have very little money since most of it probably disappeared, and are probably having other kinds of shortages because the first thing Americans do when society collapses is re-establish international trade rather than start farming...to eat.