Han dynasty
To the north of China proper, the nomadic Xiongnu chieftain Modu Chanyu (r. 209–174 BC) conquered various tribes inhabiting the eastern portion of the Eurasian Steppe. By the end of his reign, he controlled Manchuria, Mongolia, and the Tarim Basin, subjugating over twenty states east of Samarkand. Emperor Gaozu was troubled about the abundant Han-manufactured iron weapons traded to the Xiongnu along the northern borders, and he established a trade embargo against the group. In retaliation, the Xiongnu invaded what is now Shanxi province, where they defeated the Han forces at Baideng in 200 BC. After negotiations, the "heqin" agreement in 198 BC nominally held the leaders of the Xiongnu and the Han as equal partners in a royal marriage alliance, but the Han were forced to send large amounts of tribute items such as silk clothes, food, and wine to the Xiongnu.
Former Zhao
By the 280s, a huge number (approximately 400,000) of Xiongnu herdsmen resided in the Ordos Desert and Bing, a political division including modern-day areas of the whole Shanxi province, southwestern part of Inner Mongolia and eastern part of Shaanxi province, after Cao Cao moved them there and split them into "five departments" (五部, pinyin Wǔbù). The Southern Xiongnu continued their nomadic lifestyles of the steppes with horse breeding and to some extent agriculture. In spite of significant loss of Chinese sedentary population, the Chinese portion of the population in the state is estimated to be around 1,500,000. In addition to the Southern Xiongnu nomads, the state numbered 1,000,000 of other nomadic tribes, mainly Jie, Xianbei, Di, and Qiang, for a total of approximately 1,400,000 nomadic population, or 200 thousand yurts.