Why are Fuyang people the same as Shandong people?

Fuyang people are the same as Shandong people because most people in Fuyang, Anhui Province moved from Shandong. According to relevant data, Fuyang people and Huaibei people are mostly from Zaolinzhuang, Shandong (in Yanzhou). Fuyang is a prefecture-level city in Anhui Province, located in the northwest of Anhui Province and at the southern end of North China Plain. It is adjacent to Zhoukou City, Henan Province in the northwest, Xincai County, Henan Province in the west, Xinyang City, Henan Province in the southwest, Bozhou City in the north and northeast, Huainan City in the east and Lu 'an City in the south across the Huaihe River.