List the main manifestations of ethnic integration and development in the Yuan Dynasty.

(1) The national integration of the Yuan Dynasty appeared on the basis of the national unity of the Yuan Dynasty, with a wide range;

(2) In the Yuan Dynasty, the Khitan, Nuzhen and other ethnic groups who first entered the Yellow River valley were no different from the Han nationality after living together for a long time, and were called "Han nationality";

(3) Most importantly, Persians and Arabs moved to China in Yuan Dynasty, where they lived together with the Han, Mongolian, Uygur and other ethnic groups for a long time, married each other and merged into a new ethnic group-Hui.