Why is Yongxiu dialect very similar to Nanchang dialect?

Yongxiu dialect is similar to Nanchang dialect because it belongs to Gan dialect and Jiangxi dialect and is the same language.

1, Jiujiang dialect belongs to Jianghuai Mandarin, which is spoken by the descendants of immigrants from Jiangbei, and is not a language family with Jiangxi dialect. People who speak Jiujiang dialect can't understand Nanchang dialect and Yongxiu dialect. When Jiujiang was in the Taiping Heavenly Kingdom, the population dropped sharply, and a large number of people from Jiangbei immigrated, so they brought Jianghuai Mandarin instead of people who used to speak Gan dialect.

2. Yongxiu dialect is the common wealth and cultural heritage of all Yongxiu people and must be well preserved.