What would be the definition of invade here? Stationing troops on Taiwan? Port call in Taiwan with a warship? The US knows that if they shoot first, they will be seen as the aggressors. The goal would be to bait China into shooting first. Heck, they can even engineer a false flag as they have done before.
If that happen then we will see how 'One China policy' really mean to those nation that said they uphold it.
It's doesn't need to shoot first to be seen as agressor. Otherwise, may be China should send PLAGF and PLAN to station in Manhattan as a respond to US.
Unsinkable carrier? Missile base to make sure they have leverage against China in conflict?Take semiconductors for example. They are essentially Taipei's only bargaining chip (pun totally intended) with the US. If Taiwan was no longer the sole supplier of cutting edge chips, would the US really go to such lengths to start shit? If China completely takes over the semiconductor industry, what would be the point of Taiwan anymore?
That island is their key to contained China power projection in Asia.