《史记·三十世家·燕召公世家》
燕王喜六年，秦国灭掉东周，设置了三川郡。
六年，秦灭东周，置三川郡。
In the sixth year of King Xi of Yan, the state of Qin destroyed the Eastern Zhou and established the Sanchuan Commandery.
<s>[INST] Kindly elucidate the central themes in this passage in English: 六年，秦灭东周，置三川郡。 [/INST] In the sixth year of King Xi of Yan, the state of Qin destroyed the Eastern Zhou and established the Sanchuan Commandery.</s>
Kindly elucidate the central themes in this passage in English: 六年，秦灭东周，置三川郡。
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In the sixth year of King Xi of Yan, the state of Qin destroyed the Eastern Zhou and established the Sanchuan Commandery.
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