Mr. FuManChu please don't forget the fact that the US sold F16 long before PRC started to accumulate his missiles across the straits. We all know the Shang Hai communiqu’e was the result of cold war. Just like US's support of Taiwan, it's purely a geopolitical exchange of national interests.
Let's back to the thread topic. Mr. Jwangyue's scenario will cause very nasty results for world economy. This is scenario jumped up from my mind. Let's start from refreshment of our memory of super-inflation in Germany after WWI and its cause for chaos of German economy and uprising of Hitler. China puts around 40% of its foreign reserve buying US treasuries. So do the other major foreign reserve countries such as Japan, Taiwan, and OPEC countries. Almost at the same time that Taiwan declared independence, all major stock indexes will tumble. Why? Because nowadays China and Taiwan supply more than 66% of electronic finished goods and electronic components worldwide, let alone those inexpensive daily consumption goods and car parts.
When military confrontation between China and US starts, as soon as China dumps the treasuries he holds, so will other major foreign treasuries owners. The acceleration of dumping will drive the depreciation of US dollar. The dumping of treasuries will also drive interest rate high. It is so high that credit crunch will cause trouble for cash scarce companies and individuals.
It should be no doubt that US can defeat China in military, but you must ask, 'How long and how much will it take?' Judging from the expenditure in Iraq, the figure might be hard to imagine. And after all these, we have to ask what it is really for.