《新唐书·列传·卷四十五》
东汉光武末年，它才请求纳为属国，设永昌郡统辖它。
东汉光武末，始请内属，置永昌郡统之。
At the end of the Eastern Han Dynasty, Guangwu only asked to be included as a vassal state, and established the Yongchang County to govern it.
<s>[INST] Kindly elucidate the central themes in this passage in English: 东汉光武末，始请内属，置永昌郡统之。 [/INST] At the end of the Eastern Han Dynasty, Guangwu only asked to be included as a vassal state, and established the Yongchang County to govern it.</s>
Kindly elucidate the central themes in this passage in English: 东汉光武末，始请内属，置永昌郡统之。
user
At the end of the Eastern Han Dynasty, Guangwu only asked to be included as a vassal state, and established the Yongchang County to govern it.
assistant