The first question: Reasons for Xianbei: At the end of the Eastern Jin Dynasty, Xianbei people in the northeast began to grow and March into the Central Plains. After that, northern China was basically ruled by Xianbei regime for more than 200 years, but there were also many wars. This is the period of "Five Chaos in China" in history. Huns and Turks are both northern grassland peoples.

The second question, the reason for choosing all, is a picture, and you can see the history of change by yourself.

Image from Guan Cat, Zhihu.

The third question AD reason: Qiang people live in Sichuan area and Li people live in Guangxi area. Qidan is a northern grassland nationality, and Lou lives in the northeast.

The fourth question is wrong. Yuan Zhen, a native of Luoyang, Henan Province, is the grandson of Emperor Zhaocheng of the Northern Wei Dynasty, and his surname is Yuan. Northern Wei belongs to Xianbei Tuoba nationality. Not Mongolian. Yuan Jie is a descendant of Xianbei and lives in Taiyuan.

The fifth question is correct.

It's not easy to hit by hand, hope to adopt it.