公元前221年，秦统一中国后统一了中国文字。
战国末期为秦国领地，秦统一中国后属北地郡。
Qin territory for the late Warring States, Qin unified China after a county in the north.
夏夷思想是从春秋、战国时期到秦统一中国的漫长的历史过程中由产生而日渐系统化的。
The thought of Xia and Yi gradually came to being and became systematic in the long history course from Spring-Autumn period and the Warring-States period to Qin-Han Dynasties.
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