> There is zero chance of China invading the US or vice versa. But this issue isn't about a ground war in either place, it's about a war in some 3rd place.Agreed
> It needs them to project power into other parts of the world.
China can barely project power in its own backyard while the US has nearly a century of experience projecting around the world, with eleven carrier groups to China's two. Assuming they all get destroyed by hypersonic missiles within the first few months, the US still has military bases all over the world. As far as I know, China has zero military presence in the Western hemisphere except some surveillance balloons.
China may have a short term advantage in production and cost but the US has the advantage in every other area of logistics relevant to a military.
> Take Taiwan. If China invades there that represents a significant dilemma for the US. On balance, they'll likely make a token response, then fade away. Places where the US has enjoyed power (like the South China Sea) might be harder to protect.
Absolutely but it'd be a pyrrhic victory worth little except as domestic propaganda. If the US does help defend Taiwan, the invading Chinese fleet will likely be massacred. There's little room to hide in the 80 mile wide Taiwan strait against modern anti-ship and anti-aircraft weapons. China's only real advantage will likely be air power, which doesn't win wars without lots of boots on the ground.
> Does the US have the stomach for wars in Taiwan, Japan or Australia?
I'm not sure about Taiwan, but I don't think we'd let Japan or Australia slip into war without assistance. (but what do I know? :-))