Why didn't the Ming Dynasty completely inherit the territory as big as the Mongolian Empire?

Because of the size of the Mongol Empire, it had no effect on the Ming Dynasty at that time. Because ancient times was a farming civilization. The Mongolian empire at that time was not suitable for developing agriculture. In this case, the Ming Dynasty gave up this piece of land under the guidance of the original residence. In addition, although the territory of the Mongolian empire was large at that time, it was not completely ruled. Want to rule completely also need to lead the army to attack.

and under the circumstances at that time, Zhu Yuanzhang thought that the country he had laid was big enough. In order to show their generosity and tolerance, they did not conquer these submissive Mongolian tribes. At that time, the Mongols still had many shortcomings, and they clung to the Ming Dynasty with land and property, hoping to get the protection of the Ming Dynasty. And Zhu Yuanzhang was not interested in the land territory of the Yuan Empire from the beginning. The Ming dynasty has always set its sights on the ocean. In the early Ming Dynasty, the navy had few rivals in the world at that time.

and at that time, although the territory of the Mongolian empire was large, it was not actually ruled. Genghis Khan also gave his son a fair share in the field of laying the central region and established a separate khanate. Moreover, Genghis Khan belongs to an independent nomadic people. They all left after robbing the silent financial report, and did not want to stay as a ruler or do anything else.

for Zhu Yuanzhang at that time, the territory of the Mongolian empire was a pity for him to eat tasteless and abandon it. Because Zhu Yuanzhang himself was born as a farmer, his yearning for land is farming land where he can grow food. However, Mongolia is a cold region, and the Mongolian Empire is not a suitable place for farming. And it is also a very unworthy thing to fight for this barren land and the brave Mongols for a long time.