Why did Nanning become a Mandarin-speaking city?

The above is correct. It turns out that Nanning speaks vernacular. My understanding is that since Putonghua is being promoted throughout the country, the country intends to start with Guangxi and Guangdong provinces. However, due to the strength of the Guangdong government and the unity of the Guangdong people, the promotion of Putonghua in Guangdong has not achieved much. On the contrary, in Guangxi, the government of Guangxi is not as eloquent as the government of Guangdong. Even if Guangxi people objected at that time, it was useless. At least it was a poor country at that time. The vernacular radio and TV stations in Nanning have been abolished one after another. Originally, all the broadcasts I heard by bus were in vernacular, but as I said just now, Guangxi has made great achievements in popularizing Putonghua. . . So the vernacular was gradually forgotten, but most families in Nanning still spoke it from generation to generation. . It's just what I said upstairs. Most foreign exchanges are in Mandarin. . . Unfortunately, Nanning was originally a pure white city and was ordered by the policy. . .