Why did Vietnam become independent soon after it was incorporated into the Ming Dynasty?

1. At that time, Vietnam was far away from the ruling center of the Ming Dynasty, and the environment was harsh, so the Ming government could never implement effective management.

2. At that time, just after Vietnam was incorporated into the Ming Dynasty, the local people's hearts had not yet joined, and the remnants of the former dynasty rebelled from time to time, resulting in unstable local situation.

3. The local officials and garrisons stationed in Ming Dynasty regarded the local people as barbarians, which led to local unrest in order to take effective appeasement measures.