What kind of place name migration in the sense of historical geography reflects profound historical changes?

The long-distance migration of place names is mostly related to population migration, and "Xinfeng" is a very representative example. In the Western Han Dynasty, Emperor Gaodi made Guanzhong his capital. Because Taidi missed his hometown Fengyi (Pei County in Qin Dynasty, now Fengxian County in Jiangsu Province), he wanted to return to the east. In order to please his father, Liu Bang rebuilt Qin Yili according to the city streets of Fengyi, and moved part of Feng Min to Yili, so it was called "Xinfeng" (Gaudi only set up one county in seven years, but it was not renamed. After the collapse of Emperor Taizong for ten years, it was renamed Xinfeng. The old city is near Changze Village, 7 kilometers east of Lintong County and west of xingfeng. Legend has it that Xinfeng's market is exactly the same as Fengyi thousands of miles away. Once the chickens and dogs brought by immigrants from their hometown are released, they can find their own homes (animals should not identify their homes only by their images, and I personally don't believe this legend). During the Eastern Jin and Southern Dynasties, due to the war in the north, the population moved from the north to the south, which was called overseas Chinese. In the Eastern Jin Dynasty and the Southern Dynasties, the government mostly used the names of overseas Chinese to reset the administrative divisions, which were called overseas Chinese states, overseas Chinese counties (even overseas Chinese towns and villages), or simply "overseas Chinese families". Song Shu: After Yongjia, "the states of Si, Ji, Yong, Liang, Qing, He, Yan, Yu, You and Ping disappeared for a while, and the adherents crossed south, and the overseas Chinese set up the Ministry of Animal Husbandry, which was not old." "Sui Shu Food Records": "The Jin and Yuan emperors lived on the left side of the river, and the people fled south, so they were called overseas Chinese. They all took the old-fashioned names, and overseas Chinese were all in counties, often scattered and without aborigines. " With the southward migration of Guanzhong people, Xinfeng County has been resettled by overseas Chinese many times, and Xinfeng place names have moved many times. For example, when Emperor Rudong, Jin and Yuan were in the northwest of Jingsha City, Hubei Province, overseas Chinese settled in Xinfeng County, which was a new overseas Chinese county. During the Southern Dynasties, it was renamed Anye County. Xinfeng County was set up in the northern part of Xiangyang County, Hubei Province in the Southern Dynasties and the Song Dynasty, belonging to Jingzhao County. During the Southern Dynasties, Boluo County was located in Xinfeng County, belonging to Nanhai County, where it was located in Changjitun, northeast of Xinfeng County, Guangdong Province. In the eighteenth year of Emperor Kai of Sui Dynasty, the county was rebuilt, and Heyuan County was merged at the beginning of the great cause. Re-analysis of Heyuan, Yingde and Wengyuan in Qin Long in the third year of Ming Dynasty: Changning County moved to Huizhou Prefecture. In the third year of the Republic of China, it was renamed Xinfeng County because of the same name as Changning County in Jiangxi and Fujian. At the same time, it is worth mentioning that although many overseas Chinese settled in Xinfeng County in the south, Xinfeng County in Guanzhong still existed and was eventually abandoned in the Tang Dynasty.