Xiongnu
Sinologist Edwin Pulleyblank argued that the Xiongnu were part of a Xirong group called Yiqu, who had lived in Shaanbei and had been influenced by China for centuries, before they were driven out by the Qin dynasty. Qin's campaign against the Xiongnu expanded Qin's territory at the expense of the Xiongnu. In 215 BC, Qin Shi Huang sent General Meng Tian to conquer the Xiongnu and drive them from the Ordos Loop, which he did later that year. After the catastrophic defeat at the hands of Meng Tian, the Xiongnu leader Touman was forced to flee far into the Mongolian Plateau. The Qin empire became a threat to the Xiongnu, which ultimately led to the reorganization of the many tribes into a confederacy.In 209 BC, three years before the founding of Han China, the Xiongnu were brought together in a powerful confederation under a new chanyu, Modu Chanyu. This new political unity transformed them into a more formidable state by enabling formation of larger armies and the ability to exercise better strategic coordination. The Xiongnu adopted many of the Chinese agriculture techniques such as slave labor for heavy labor, wore silk like the Chinese, and lived in Chinese-style homes. The reason for creating the confederation remains unclear. Suggestions include the need for a stronger state to deal with the Qin unification of China that resulted in a loss of the Ordos region at the hands of Meng Tian or the political crisis that overtook the Xiongnu in 215 BC when Qin armies evicted them from their pastures on the Yellow River.
List of ancient great powers
The Great Wall of China had been constructed to protect Chinese towns from the Xiongnu attacks. While the Chinese were trying to bring the Xiongnu under control, something of high significance happened: cross-cultural encounters. A large variety of people (such as traders, ambassadors, hostages, parents in cross-cultural marriages, etc.) served as helpers that passed on ideas, values, and techniques across cultural boundary lines. These encounters helped cultures learn from other cultures. Xiongnu empire disintegrated into two parts during the 1st century, eventually the Xiongnu fell due to the defeat in the Han–Xiongnu War.Huns were nomadic people who were known for their hordes of mounted archers. Their language seems to be Turkic; but Mongolic, Yeniseian, Uralic etc., are also postulated. After 370 under a certain Balamber they founded an empire in the East Europe defeating Alans and Goths. They triggered the great migration which eventually caused the collapse of the West Roman Empire.