What country is Japan? Are there any ethnic groups?

Japan's ethnic composition is relatively simple, except for a few Ainu people (also known as Xia Yiren), all of them are Yamato ethnic groups. Ainu people are the earliest inhabitants of Japan and a member of the equatorial race. According to Japanese historical records. Ainu people were called "Mao people" in the 5th century, because they were characterized by dark skin, thick, long and curly hair, a lot of hair on their faces and bodies, and short stature. Adult males are about 1.6 meters tall. Their faces have the characteristics of Europeans, and their languages have nothing in common with those of neighboring nations and countries. Men have red beards. The clothes they wear are very similar to those of tribes living in the far north. Their legends and numerous narrative poems are similar to the folk (oral) creations of indigenous people in Oceania and Australia. In a word, this mixed culture is incredible, and this phenomenon can't be explained so far. How they came to Japan is unknown. Some people think that their ancestors migrated to Japan from Southeast Asia in the early Neolithic period (about six or seven thousand years ago). Some scholars believe that Ainu people are Arab immigrants who controlled a large area of the Far East in a certain period of time and then distributed in Honshu Island. As some Japanese tribes gradually moved to the north, their territory was shrinking. Since the second half of the 7th century, Ainu people have been called "Xiayi", which means "Yidi", a contemptuous name given to them by the reactionary rulers of the dominant Yamato clan in Japan. It gradually changed its name to Ainu people from the middle of14th century. The word "Ainu" means "human" in this language. From the16th century, some Ainu people migrated to Sakhalin Island. 17 and 18 centuries, most Ainu people were wiped out. Today, there are less than 20,000 people left. Most of them live in Rigao, Asahikawa and Kushiro in the north-central part of Hokkaido. A few are far away from Sakhalin Island and Kuril Islands, and some are scattered in some parts of the state. Ainu people used to live mainly by fishing and hunting. /kloc-At the end of 0/8th century, the Tokugawa shogunate directly sent officials to manage the Kuril Islands, opened up more than a dozen fishing grounds, and at the same time implemented the assimilation policy, requiring Ainu people to change their customs, shave their beards, wash their hair, wear kimonos, and change their names according to the Japanese way. /kloc-After the 0/9th century, Japan began to develop islands such as Hokkaido and popularize Yamato civilization. In this way, the traditional way of life of Ainu people has been further changed. They gave up traditional fishing and hunting and became farmers living a settled life. Ainu people have their own festivals and sacrificial activities, the most famous of which is "Bear Sacrifice". They like to carve animals, especially bears, on peeled logs with chisels, which is called "Ainu carving" in Japan. Ainu people have profound cultural heritage, are good at embroidery and love dancing. They wrote many poems and passed them down from generation to generation from memory. Some long narrative poems in Ainu language handed down from history are rich in content and take a long time to recite. Ainu people have their own language-Ainu language, which belongs to hug language. This is an independent language, belonging to Malay-Polynesian (Austronesian) language family. At present, except Ainu people, only Eskimos and American Indians use this language in the world. Many place names in northeastern Japan are derived from Ainu language. Such as "Lifu", which means "Grand Valley"; "Otaru" originally meant "Shachuan"; The original meaning of "named mail" is "crow infested city" and so on. Ainu people have contributed to the development of Japanese archipelago, including cultural development.