Why do Canadian and Japanese scholars insist that the Shang Dynasty was founded by white people?

Judging from the unearthed cultural relics, the legendary Erlitou cultural site in Yanshi, the capital of Xia Dynasty, unearthed small bronzes, and almost no larger bronzes appeared. In the Shang dynasty, a large number of exquisite large bronzes suddenly appeared.

In other words, there is no clear transition period between them, and the bronze civilization of Shang Dynasty belongs to sudden bronze civilization. Generally speaking, there is only one explanation for this situation: foreign civilization led to the explosion of local civilization.

Therefore, some foreign scholars believe that China's commercial civilization was founded by western immigrants who mastered superb bronze smelting technology.