The cause of the small Yunnan incident

The domestic media has publicly reported the origin of the mystery of "Little Yunnan":

After more than 20 years' research, Hu, former director of Tiexi District Local Records Office in Anshan City, concluded that "Little Yunnan is located in today's Yunnan-Guizhou area, that is, Wushawei in Ming Dynasty". Since then, many readers across the country have paid extensive attention to it, and six theories about the origin of "Little Yunnan" have surfaced after induction.