Technically the US supports the one China policy. It is assumed WW3 starts if that ever changes.
The US walks a line on Taiwan that falls far short of actual support for One China but does enough to support it that the US has a lot of room to escalate with China if the US wants to without starting WW3.
Comments
The US walks a line on Taiwan that falls far short of actual support for One China but does enough to support it that the US has a lot of room to escalate with China if the US wants to without starting WW3.