I definitely agree that there were many pre-Columbian migrations to America spanning thousands of years and likely emanating from places as far flung as Asia, Polynesia, Australia, Europe and possibly North Africa. It’s a fascinating subject that archeologists are only beginning to understand. But the particular migration being discussed in this program is suspect IMO. Even Chinese scholars have questioned the authenticity of the maps that are cited to make the case.
Those who say, “What difference does it make? The largest pre-Columbian migrations clearly came from Asia” miss the point. Asia and China describe two separate things. When we’re talking China, we’re referring to not only an ethnic grouping but also a political entity. The Asians who came to America thousands of years ago may have been ancestors to modern Chinese, but they had no connection to the relatively new entity known as China. Attempts to specifically credit Chinese civilization with extensive pre-Columbian exploration of America likely have a political agenda, so any evidence proffered to make the case should be looked at very carefully and with some skepticism.
1421- that’s the name of a book. Zheng He. China was China in 1421. it was not an immigration. It was exploration. The fleet probably did lease people in South America. The first Spanish explorers met a small population of people with silk garments and other apparently Chinese characteristics.