Currently, this is a war by the American ruling class. The American electorate is either divided about it, and people are not real jazzed about it.
We either aren't paying attention, or don't care.
There is absolutely NO RISK of any power taking Alaska or California.
America was born in the flames of revolt from the oppression from a foreign power. We have more people in this nation that know how to make their own bullets, their own arms, and their own munitions than any place on the planet.
Nothing would unite this nation more, than a foreign invasion. The global ruling elites would assassinate leaders of any government that would even consider it, and forbid any nation to invade us, unless it were a multinational coalition of many nations, which would ensure an immediate success.