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Is the Hui nationality unique to China or are Saudi Arabia, Iraq and Iran also Hui nationality countries?

China's unique ethnic group.

At that time, Mongolia's western expedition hit Europe along the direction of Central Asia and West Asia, and established several khanates, including parts of Central Asia, the Middle East, West Asia and Persia. Later, some of them moved back to the Hexi Corridor in China, where they merged with the local ethnic groups, mainly the Han nationality, and formed a unique ethnic group, all of which believed in Muslim religion like Arab countries. This is why the Hui people in China look different from Arabs who are also Muslims or people from West Asian countries.