The Rebellion of the Seven States took place in 154 BC against the Han dynasty of China by its regional semi-autonomous kings, to resist the emperor's attempt to centralize the government further.
Emperor Gaozu had initially created imperial princes with independent military powers with an eye to having them protect the dynasty from outside. By the time of Emperor Jing, however, they were already creating problems by their refusal to follow the imperial government's laws and orders. Had the seven princes prevailed in this conflict, in all likelihood the Han dynasty would have collapsed into a loose confederation of states. In the aftermath of the rebellion, while the principality system was maintained, the powers of the princes were gradually reduced and the sizes of the principalities reduced as well, under Emperor Jing and his son Emperor Wu. With the longevity of the Han dynasty, the Chinese mindset of it being normal to have a unified empire rather than divided states started to settle in.