What is the origin of ancient Chinese civilization and when was it established? Why is it considered one of the oldest civilizations in the world?

The unique aspect of Chinese civilization is that they maintained a stable Empire, more or less, anyway, for over 2000 years. This probably could be attributable more to their isolated geographic location, than anything else. The Chinese did not need to worry about being overrun by barbarians nearly as much as other civilizations because they were totally surrounded by impassible mountains, oceans and deserts. The one place they had to worry about — to the North — they controlled with an enormous wall, thousands of miles long. They still were invaded from the North from time to time, most notably by the Mongols, but, the Great Wall of China did contain things to a large degree. The first unified Chinese Imperial Dynasty — the Qin — was established decisively in 221 B.C., effectively turning all the independent states of China into a single empire. If you’re interested, here’s a stunningly beautiful, 81 episode series on the first Chinese dowager Empress, Mi Yue: https://www.youtube.com/watch?v=bzz5GMJjtF0This woman, born over a century earlier, lived to a great age, and was supposedly the mother of one of the most important Kings of the Qin, and ancestor of the first Qin emperor. https://www.quora.com/What-is-the-origin-of-ancient-Chinese-civilization-and-when-was-it-established-Why-is-it-considered-one-of-the-oldest-civilizations-in-the-world