Why did Ming Taizu list "fifteen countries that don't tax"?

In a.d. 1368, Zhu Yuanzhang proclaimed himself emperor, with Tianfu as his capital and Daming as his title. After that, Zhu Yuanzhang led the army to capture Dadu in the Northern Expedition, and Yuan Shundi fled, completely ending the Mongolian rule in the Central Plains. During Zhu Yuanzhang's reign, he encouraged farmers to return to agriculture and engage in resettlement and military camps; Organize local farmers to build water conservancy projects; At the same time, he also listed fifteen countries that were not recruited in the army.

The fifteen countries that did not sign up were: Korea, Japan, Ryukyu Kingdom, Ryukyu Kingdom, Annan Kingdom, Zhenla Kingdom, Siam State, Zhancheng State, Sumatra State, Xiqiao State, Guawa State, Kanheng State, Baihua State, Sanfo State and Boni State.

These fifteen countries were listed by Zhu Yuanzhang, the founder of Ming Dynasty, in the 28th year of Hongwu, in which he warned future generations not to invade and conquer these countries at will.

The reason why Zhu Yuanzhang refused to let future generations use force against the fifteen countries around him shows that Ming Taizu is not a ruler of force. Thirty years after Hongwu, the Yuan Dynasty had established its prestige in Southeast Asia, and almost all neighboring countries had their own vassals. For such a huge territorial power, small countries have long surrendered.

For example, after North Korea surrendered to the Ming Dynasty, Ming Taizu, inspired by past experience, did not directly interfere in North Korea's internal affairs, but let it "govern the United States with the United States".

At that time, Zhu Yuanzhang proposed Yunnan to korean king to show that conquest was neither good for China nor bad for the other side. He doesn't want to explore himself. As long as North Korea keeps its promise and treats each other sincerely, the two countries will live in peace. In the face of changes in the situation, North Korea had to cut off its relations with Beiyuan and restore its friendly relations with the Ming Dynasty.

This is consistent with Ming Taizu's policy of "all countries come to North Korea" after the implementation of the Ninth Five-Year Plan. In the final analysis, Zhu Yuanzhang is a realist. He had to consider the calculation of actual gains and losses, so Ming Taizu finally came to the conclusion that all these countries that were not included in the levy were separated by mountains and seas. Insufficient land supply; Getting the people is not enough to establish order.

Zhu Yuanzhang believes that the value that these four barbarians can use is really too little; It is not easy to take these sinister places by force. In Zhu Yuanzhang's eyes, these small countries are not afraid of threats, so he is afraid that his descendants will rely on the strength of Daming, so he lists these 15 countries as non-expropriation countries.

But in history, the descendants of Zhu Yuanzhang did not completely expropriate these countries: for example, Japan, which invaded Korea thousands of years ago, was conquered.