China has made big short-term gains because of an authoritarian rule. But, for a sustained growth, like that of USA, you need an open, democratic society which allows people to express their newly find voice. As people gain wealth, exposure and education, they gain new intellectual capabilities. This capability can be used for innovation but that requires people don't have undue pressure - they feel free to express their ideas and thoughts. If you're in constant battle with your own people/government, lot of energy is wasted that could otherwise be used to do more important things that can take you and yoru nation further.