How does Emperor Ama talk about "China culture" in Princess Zhu Huan? Er Kang actually called Wei Zi "China". At that time, our country was already called China.

I hope it will help you: China at that time was not China now, but China in the Central Plains. It appeared under the names of Huaxia, Zhonghua, Midsummer, Zhu Xia, Zhu Hua, Shenzhou, and China. It first referred to the "center" of the world-the Central Plains Heluo Zone in the middle and lower reaches of the Yellow River Basin, and later gradually formed. But the "China" in The Book of Songs is actually a "capital city", not a real country. The word "China", referring to the country, has been very common in the books of various schools of thought in the Eastern Zhou Dynasty and the Warring States Period. For example, Mencius on Teng Wengong said: "Chen Liang originated from the way of Duke Zhong Ni of Zhou, and learned from China in the north", "The way of animal hoof and bird trail was handed over to China"; "Zhuangzi Tian Zifang": "A gentleman in China knows the meaning of his etiquette, but he knows the inferiority of his heart" ... All these show that the so-called "China" in ancient times refers to the "Central Plains" of later generations. However, the area is not as wide as that of the Central Plains in later generations, and it is only equivalent to most of Henan, southwestern Shaanxi and southwestern Shanxi in the middle and lower reaches of the Yellow River today.