According to the existing archaeological data, when did the Shang Dynasty spread southward to Jiangxi at the latest?

In the Shang Dynasty, it was specifically the upper level of Erligang.

It is embodied in the rise of Wucheng culture in the north, northwest, middle and lower reaches of Ganjiang River, west of Poyang Lake. Inspired by the commercial civilization of the Central Plains, this culture has a strong commercial culture color of the Central Plains and its own distinctive local characteristics. Typical sites include Zhangshu Wucheng Site, Ruichang Tongling Shang and Zhou Mining Site, Xin 'gan County Oceania Shang Dynasty Remains, etc.

The bronzes unearthed from the site of Oceania can be compared with those unearthed from Yin Ruins and Sanxingdui in Anyang. The excavation of (Oceania site) proves once again that there are indigenous bronze inscriptions (Gannan) in the Ganjiang River Basin, which are different from the Shang-Yin bronze civilization in the Central Plains. It was the concentrated place and base camp of Fujian-Guangdong immigrants in the Ming and Qing Dynasties. Wan Hu Town is one of the largest printing bases in China. ?

Extended data

Jiao Shan site is the earliest kiln site in ancient China where primitive ceramics were made, which was excavated by China so far. (Jiao Shan Site) is the largest commercial kiln in the south of the Yangtze River and even the whole country. Nanfeng is known as the "hometown of Nuo dance" (blue and white), making Jingdezhen porcelain the best in the country.

The discovery of Wucheng ruins denies the saying that "Shang culture is no better than the Yangtze River". Wucheng site is the largest Shang and Zhou cultural site in the south of China.

Baidu Encyclopedia-Shang Tomb in Oceania

Baidu Encyclopedia-Chestnut Mountain Site in Jiao Shan

Baidu encyclopedia-wucheng site