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Declaring war on China would be an act of madness. The economy is far too tied into it, and plus the majority of the American public wouldn't support it, anyways.

Roosevelt was in the same position, trying to figure out how to enter WWII with an American public that was already worried about the war in Europe and not wanting to get involved with the developments in Asia. Once Japan bombed Pearl Harbor, he had a finally had a pretext to declare war which everyone could get on board with. Then Hitler declared war against the US shortly after in support of Axis agreements, and the US could enter the war from that direction, too.

But China isn't Germany or Japan. For one, it's a nuclear power, too. It has about 200-ish warheads, any of which could be active. The States wouldn't be able to first strike, because it's contrary to international opinion, which it still needs to worry about because of the thousands of nuclear warheads in countries like Russia, UK, France, etc. China would be able to strike back in self-defence though, actually supported under the Geneva Conventions which also specifically prohibits the use of chemical or biological warfare.

You could carpet bomb all the cities and military installations with conventional weapons but in the end such a war could only be won on the ground. And China's got over a billion people, of which it's thought 200 million could be put under arms to fight for the Motherland. That would be a moderate mobilization. The only higher military mobilization in recorded history, other than Rome after Cannae, was the US itself in WWII, when it hit about 25% of the population directly involved in the war effort. It wouldn't end well.