What is the first great nomad confederation that historians have clearly identified?

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The Xiongnu, also known as the Huns, were the first great nomad confederation that historians have clearly identified. They were a powerful group of pastoral nomads who occupied vast territories in Central Asia from the 3rd century BCE to the late 1st century CE, and played a significant role in the history of China and Central Asia.

What Is the First Great Nomad Confederation That Historians Have