If China really wanted to reclaim Taiwan how likely is it that the US really go to war?

If one day China decided it wanted control over Taiwan and was willing to do so by invasion, would the US really go to war if it would envelope Japan and other neighboring countries? If Hawaii decided to flee the US and Russia armed it and offered support that if the US tried to reign them back in Russia would have Hawaii’s back, would the US want it back that bad if it meant Canada and Mexico would get caught up in it also?