Why do many people in china refer to themselves as "people of han"

Are an ethnic group native to East Asia. They constitute approximately 92% of the population of China, 95% of the population of Taiwan 76% of the citizens of Singapore, 23% of the population of Malaysia and about 18% of the entire global human population. Han Chinese are the world's largest ethnic group with over 1.3 billion people.

Early Greece is very mountainous on islands and in the mainland and it was a very populated area to where even today in Greece instead of building a new house they just build up if a new person is born in a family instead of buying a new house the male Father Figure is expected to build another floor or another room for that child