Why did the Ming Dynasty want Tubo instead of the Western Regions?

1. In fact, the control of the Ming Dynasty on Tubo was not high. The main reason is the degradation of Tubo's own combat effectiveness, which led to its surrender to the Ming Dynasty.

2. One reason is that the arrival of the Little Ice Age and the destruction of the western environment led to the eastward movement of the economic center. During the Tang Dynasty, it was relatively easy to control the western regions with Chang 'an as the core, and the western regions were also the only way of the Silk Road. With the rise of the Maritime Silk Road in Ming Dynasty, the economic centers were all along the coast, and the status of the western regions was greatly reduced.