It's also not the US's choice. The European empire, which the US inherited and evolved, is slowly but surely ending. The integration will happen, and the US won't launch a world war to stop it, because China won't launch a war to integrate, because China isn't the belligerent that the West has been trying to invent through propaganda for 2 centuries. Instead, China will continue to assert its position, demonstrate it's ability to protect Taiwan from further imperial manipulation, and wait until Taiwan is ready to experiment with "one country, two systems". China, unlike the West, can wait for a long time.