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China emerged as one of the world's earliest civilizations, in the fertile basin of the Yellow River in the North China Plain.
For millennia, China's political system was based on hereditary monarchies, or dynasties, beginning with the semi-legendary Xia dynasty in 21st century BCE.
Han China gradually became the largest economy of the ancient world.
The Song dynasty ended the separatist situation in 960, leading to a balance of power between the Song and Khitan Liao.