In 626 AD, the Xuanwu Gate Incident occurred. Li Shimin killed his brother and forced his father to become the second emperor of the Tang Dynasty, Emperor Taizong of the Tang Dynasty.He learned from the lessons of the fall of the Sui Dynasty, recruited talents, was good at accepting advice, emphasized the rule of law, paid attention to agriculture, developed the population, stabilized the border areas, and brought barbarians to the dynasty. People of all ethnic groups lived and worked in peace and contentment and lived in harmony. The Tang Dynasty...