Democratic policies are generally implemented when a country is relatively poor and weak. In order to avoid war in our country. In the early days of the Han Dynasty and the Tang Dynasty, all countries were poor and weak, and did not have enough strength to fight against minority regimes. They adopted a temporary in-laws policy, giving themselves a chance to cultivate and live, which is equivalent to eating and drinking. Then when you have the strength, start fighting back. After Emperor Wu of the Han Dynasty, he fought against the Huns, and he also fought back during the reign of Emperor Gaozong and Wu Zetian in the Tang Dynasty.