>>7
If the US declared a trade embargo against China tomorrow, in six months the Chinese government would collapse and it'd be back to warlords, bandit armies, and anarchy, like the 1920s all over again, even without a naval blockade of their port cities, which they are powerless to prevent. Without the inflow of American hard currency China's economy withers on the vine and their society collapses.

Also, you have overlooked the fact that the Japanese and Chinese do not especially like one another.