I really want to know the history of Chongming Island and the origin of Yang's surname on Chongming Island.

Yang was born in today's Shanxi Province. After Yang Weijin was destroyed, his descendants developed and multiplied westward, first moved to Shaanxi, then moved to Huoxian county in the middle reaches of Fenshui River in Shanxi, and then propagated in Henan, which became the mainstream of the development of Yang surname in later generations. By the Han Dynasty, the surname Yang had been widely distributed in most parts of northern China. Yang entered Sichuan at this time, mostly moved from Hubei and Shaanxi provinces. During the Spring and Autumn Period and the Warring States Period, Yang people moved south to Jianghan area (now Qianjiang area in Hubei Province), and were forced to move southeast to Jiangxi due to the growing influence of Chu. At the same time, Yang, who moved from Shanxi to Jiangsu and Anhui provinces, was scattered in the middle and lower reaches of the Yangtze River. The Jin and Tang Dynasties was an important period for Yang to multiply in the north and south, especially in the south. During this period, due to the "Yongjia Rebellion" in the late Western Jin Dynasty and the "Anshi Rebellion" in the Tang Dynasty, Yang moved to the south in a big way. Since the Song Dynasty, Yang has been widely distributed in the vast areas of the south of the Yangtze River, with Fujian as the center of broadcasting and relocation. In short, before the Sui and Tang Dynasties, the clan of Yang was concentrated in Henan, Shanxi and Shaanxi provinces, and there was a line centered on Tianshui in Gansu and centered on Hunan and Jiangxi. Since then, it has gradually developed to Hebei, Shandong, Inner Mongolia, Anhui, Hunan, eastern Zhejiang, Fujian, Guangdong, Sichuan, Guizhou, Yunnan, Guangxi and other places, until it was compiled all over the country.