 Complete the following phrase:  The Kazakh Khanate , ,  was a successor of the Golden Horde existing from the 15th to 19th century, located roughly on the territory of the present-day Republic of Kazakhstan. At its height, the khanate ruled from eastern Cumania modern-day West Kazakhstan to most of Uzbekistan, Karakalpakstan and the Syr Darya river with military confrontation as far as Astrakhan and Khorasan Province, which are now in Russia and Iran, respectively. The Khanate also engaged in slavery and raids in its neighboring countries of Russia and Central Asia, and was later weakened by a series of Oirat and 