The region was first populated by hominins in the Late Pleistocene, approximately 100,000 years ago, and modern humans are confirmed to arrived in the region by 45,000 years ago with the first humans in the region having West Eurasian origins. Its Neolithic culture is characterized by characteristic stone production techniques and the presence of pottery of eastern origin. The Bronze Age began during the 3rd millennium BCE, with influences of Indo-Iranian cultures as evidenced by the Andronovo culture. During the 1st millennium BCE, polities such as the Scythians and Xiongnus emerged in the region, who often clashed with its Persian and Chinese neighbors in the south. The Göktürks dominated southern Siberia during the 1st millennium CE, while in the early 2nd millennium CE, the Mongol Empire and its successor states ruled the region. The Khanate of Sibir was one of the last independent Turkic states in North Asia before its conquest by the Tsardom of Russia in the 16th century CE. Russia would then gradually annex the region into its territory until the Convention of Peking was signed in 1860. After the October Revolution in 1917, the region was contested between the Bolsheviks and Whites until the Soviet Union asserted full control in 1923. The collapse of the Soviet Union in 1991 left Russia as the administrator of the region.