Khiva, like Bukhara, was a powerful city state on built on an old oasis between the Kyzl Kum and Kara Kum deserts. It grew to become a major trading post on the Silk Road, building up a specialty in slave trading. Khiva continued to grow and developed a small empire, including much of modern day Turkmenistan, before it was overcome by Russian forces in 1873. With the formation of the Soviet Union it was included rather strangely in Uzbekistan, despite its people being mainly Turkmen in origin, and its history intertwined with that of Turkmenistan.