What is the basis of China's ancient legends and how to explain the similarities between African and American myths and legends?

1. According to the general history of the world, merchants are a small group of Mongols who rose in the northwest prairie. They mastered the technology of smelting bronze and making chariots in the Middle East through indirect means, and then used the military advantages brought by these technologies to invade North China and conquer the local agricultural villages that were still in the Neolithic age. China has gained a new form of development: the new technology adopted by businessmen enriches the local culture, and the businessmen are finally assimilated by the local culture, which makes the tradition of China people continue uninterrupted. This form of development was repeated every time China was invaded, and it was repeated many times in the following thousands of years. Shang civilization consists of many components, such as barley, wheat, sheep, cattle, horses, bronze and wheels. If we trace back to their Neolithic origins, we will undoubtedly find that they originated in the Middle East. -This passage seems to be on page 77 of Volume I of Global History (Shanghai Academy of Social Sciences Edition).

2. What does "my ancestors came from Kunlun" mean? Does it mean that China is from the west?

China comes from the West, at least partly from Central Asia in the West.

China's ancient books clearly recorded that "my ancestors came from Kunlun", and the Sino-Tibetan language system also confirmed linguistically that China people came from Central Asia, and Exodus clearly stated the origin of China people.