How come Xichang dialect in Sichuan is so similar to Duyun dialect in Guizhou! ! !

It is true that what Yunguichuan said is all southwest mandarin, which is very similar in itself.

The Han nationality in Xichang, like the Han nationality in the mountainous area of southern Guizhou, moved with the army in the early Ming Dynasty, and there was a common cultural exchange and integration between the immigrant Han nationality and the local ethnic minorities, so the dialect system was closer and more normal.