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While America had their own problems to deal with, China was busy with theirs. 

First and foremost, they had a problem with power supply. China's military power was not as strong as America's and without Jiang Fei, they would have lost the war. The problem with power supply was with the offensive weapons. Their defense was strong but it needed the power supply to be redirected from the entire country to power up their defenses. Right then, most of their main attack forces were rendered useless due to insufficient power. With China's current naval fleet, they would never win against America in an all-out war.