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After the Xuanwumen Incident, external enemies peered at the Tang Dynasty and pointed their troops at Chang'an. In this emerging country, the emperor's magnanimity determines the spirit of the country. Should the Tang Dynasty adopt the ruthless wars of Emperor Wu of the Han Dynasty, which depleted national power, attacked each other, won the war, lost the hearts of the people, and fell into the endless cycle of war and peace in the Central Plains and nomads; or should the Tang Dynasty find a foreign policy with the characteristics of the Tang Dynasty, cultivate friends, divide enemies and make China the center of the world through more intelligent methods.