Why did the ancients call the Japanese Fuso people? Thank you, everyone.

The fifty-fourth volume of Liang Shu records that there is a country called "Fusang" in the East China Sea of China, which is three Vandory from the mainland. This is the first time in the official history of China to record the farthest and most mysterious country in the eastern waters of China. The book discusses the geographical position, political system and laws of Fusang. Religion, local products and so on are recorded in detail. Moreover, it is pointed out that the religious belief in this country is Buddhism, which was spread only after five monks from the East traveled to this country. All the stories about Liang Shu's "Fusang Country" were told by a monk named Hui Shen. Books such as Southern History and General Examination of Documents written later than Liang Shu also recorded the story of "Fusang Country" based in Liang Shu. The French sinologist De ZENI (also translated as Kinle Gini) first linked the record of "Fusang Country" with the American continent. 1752, he saw the record of "Fusang Country" in China's ancient book "General Examination of Literature". He thought that China had discovered America as early as 1000 years ago when Columbus discovered America. From then on, up to today, many experts and scholars at home and abroad have taken an interest in Fusang Country and have done a lot of research and textual research. According to Liang Shu's "Fusang Country", Fusang Country is 32,000 miles east of Chinese mainland and in the Far East of Japan. Because it is rich in a kind of hibiscus wood, it is named hibiscus country. Most scholars believe that the hibiscus described in the book is the agave abundant in Central and South America. Others think it may refer to corn, a crop unique to the United States. Many products mentioned in the book can also be confirmed in Central and South America today. Some scholars have found that the architecture, writing, criminal law system and state system of Fusang country recorded in historical books are similar to those of ancient Mexico. In short, the records in the book can be found in Mexico more or less. Therefore, some experts and scholars believe that Fusang is Mexico today. Most scholars believe that monk Hui Shen is from China. Some scholars compiled the chronicle of Hui Shen, a monk in China in the 5th century A.D. according to ancient books, and affirmed the existence of Hui Shen. On the other hand, according to the records of Mexican historical books, foreign scholars believe that "Gissac, with white hair and beard, crossed the sea from the east to Mexico, dressed in robes and big sleeves, accompanied by many companions" is the legendary snake god Hui Shen in Mexico. In La Quebrada Square in Acapulco, Mexico, there is a monument to the arrival of a Chinese sailboat, commemorating a Chinese sailboat that arrived there more than/kloc-0,000 years ago. The mentioned time coincides with the time of "Shen Hui's East Crossing America" recorded in Liang Shu. If the mystery of "Fusang Country" and "Hui Shen" can be solved, it will undoubtedly push the prehistoric communication between China and the American continent to the 5th century or so. At the same time, it also shows that as early as that time, China's navigation level has been able to cross the Pacific Ocean, which has extended the eastern route in China's navigation history to the east a lot. Of course, as mentioned above, both the Olympic bid and Fusang are mysteries under study. In addition to a lot of evidence to prove its authenticity, many scholars have put forward a lot of evidence to deny its authenticity. Like the legends of the Yin people's eastward crossing and Xufu's eastward crossing, the legend of the eastward crossing of Fusang also has a certain mythical color.