Dafang County in Guizhou was originally called Dading. Why did it change to Dafang? What was the source of the initial big decision?

In the eighth year of Chongzhen (AD 1635), Dafang City was established as a state, and in ten years, the Xuanwei Department of Shuixi was restored. In the third year of Kangxi in Qing Dynasty (A.D. 1664), An Kun was persuaded to rebel. The establishment of Dadingfu means that Ping An Kun's rebellion has been completed. In twenty-six years, Dadingfu was reduced to a state; In the seventh year of Yongzheng, Dadingfu was abolished in the state; 19 13 years, dading county was established in the land of the attached country; 1958 In February, Dading County was changed to Dafang County, whose original name meant to suppress ethnic minorities, so it was renamed today.