If I was a betting man, I would go for Alaska getting into bed with Canada, the Russians don't have much action over the Pacific side. The other factor is the most prolific corporate raiders in the US are Canadian, not Chinese. Hawaii would be harder to pick, it was sneaked from the British many years ago due to an American naval base so they may declare it as a hula republic by itself. The Chinese are more interested in things closer to them, Taiwan for starters and a large area of disputed waters that have many different resources in them.
California is a different proposition, it may have socialogical differences but it is a world scale economy in its own right and I can see a number of the western states trying to get into bed with California to be part of a viable economy. Northern border states will probably go with Canada if they will have them.
RE: The EU, the economic disaster has yet to fully bight, the current situation is Germany is benefiting from an artificially low Euro because of the number of basket case economies on the fringe of the EU. The bulk of the problems would be solved with each country returning to its own currency as this would allow them to float the exchange rate against each other but it will come at the price that Germany's exchange rate will go up and damage their exports.
