the problem with US is since their independence, they have always been stirring shit everywhere around the world.
every time there is a problem in their backyard, they will go elsewhere in the world to stir trouble - to create diversion / justification to enter into war. Ultimately, for their weapons manufacturers who i suppose, contribute alot of political funding more business.
US is having troubles for sure...what is sustaining them, is their innovation, their soft culture that has permeate the world. Even for China to surpass them in terms of economic statistics, these are just the hard numbers, it will take a century for China to wield "soft influence" which the US has so successfully done.
You can be sure that US will stir some shit between Taiwan and China, now they are preoccupied with settling their internal problems - with elections looming.
The only unknown is the extent of the ripples from this stirring. They decided to pass the bill to sell weapon to Taiwan just when Taiwan and China are fostering closer economic ties.
Actually, US is itself facing a declining population, they are slowly being filled up with Mexicans who is moving into US either legally or otherwise. Very soon, their demographics will change. The whites population will decline somewhat.