The change of the living customs of Bailuyuan descendants mainly stems from any major reform in history.

In the early years of the Northern Wei Dynasty, there was a man named Tuoba who wore Xianbei clothes and spoke Xianbei dialect. He used to be an "Egret Officer" without salary, but the property plundered in the war can be owned by himself. A few years later, his descendants changed their Chinese surname to Yuan, and served as Qiu, who could receive the prescribed salary, wear Hanfu, speak Chinese, and marry Han officials in North Korea.

(1) Compared with Egret Officer, what changes have taken place in the life customs of later generations?

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(2) What major reforms in history caused the changes of the descendants of "Egret Official"?

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(3) Analyze the changes in the situation of the descendants of "Egret Official" and explain the positive effects of this reform.

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Answer:

(1) Xianbei changed his surname to Han, dressed in Hanfu, spoke Chinese and married Han Guan.

(2) Emperor Xiaowen's reform in the Northern Wei Dynasty.

(3) It has accelerated the process of ethnic integration in the Yellow River Basin.