because it was a trading center and it was close to the mongols.
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as far as i know, i think they couldn't travel past the sight of land. so not far at all.
Zheng He
As far as I know, China once invaded Vietnam during Han Dynasty, the general that led the Chinese army was named Ma Yuan. In 1979 Chinese army also entered Vietnam.
We have traversed more than 100,000 li (50,000 kilometers or 30,000 miles)
The Chinese written language has changed very little since 200 B.C.