As the glaciers melted, lakes filled up and the climate got wetter. Banpo, near Xian, is a settlement site of 9,000 to 6,000 years ago. It shows a matriarchal society with a communal way of life, each individual grave of a female person being accompanied by three pieces of pottery utensils, without distinction to her status before death. In my opinion, which is not the standard opinion, that society was a good one, consistent with Taoist principles, in which people shared equally the benefits of their well-watered, productive land. One thing that I do not know, but would like to know, is the extent of contact between China and the Sphinx-Giza Civilization of the same time, about 11,600 to 6,000 years ago.
More Chinese Pyramids exist.
When the climate started to dry up after 6,000 years ago, the society changed. Burial sites of about 4,700 years ago had graves with a central male surrounded by two females, one on each side, resting on their sides facing the male . This was the time of the Yellow Emperor Huang Di, and the beginning of the Chinese calendar . When the drying climate did not continue to support everybody, conflicts began over limited resources. Male warriors who would fight and take things from others became more successful than cooperating females.