How many states were there in the Tang Dynasty?
Shangzhou in the Tang Dynasty includes Jiangzhou, Huaizhou, Huazhou, Jingzhou, Jinzhou, Xiangzhou, Qingzhou, Yangzhou, Yanzhou, Yanzhou, Fenzhou, Ruzhou, Xuzhou, Xuzhou, Tang Zhou, Songzhou, Weizhou, Suzhou, Liangzhou, Yizhou, Laizhou, Dengzhou, Yongzhou and Zhangzhou.