12世紀から中国人はもうアフリカ大量居住していた
<iframe width="1840" height="1035" src="https://www.youtube.com/embed/ubSKrexjBio" title="Medieval Contact: China meets Africa" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
<iframe width="1840" height="1035" src="https://www.youtube.com/embed/t7bfrwJ6kDM" title="Chinese Empire in America in the 1400s" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>