How and when did the Mongol state come into being?

The first memories of Mongolia date back to the 4th century BC. and 2nd century AD. At that time, the tribes of the Hun nomads lived on the territory of present-day Mongolia, who fought with the Chinese state. The Mongol state, as such, arose around the 12th century. The then Mongol tribes united and created a tribal union. The newly created state was called Hamag Mongol, ruled by Khaidu Khan. Already in 1206, the Mongol Empire was created, when all Mongol tribes from Manchuria to Altai united.