becoming Nadir's vassal. After the death of Nader Shah in 1747, the chief of the Manghit tribe, Muhammad Rahim Biy Azaliq, overcame his rivals from other tribes and consolidated his rule in the Khanate of Bukhara. His successor, however, ruled in the name of puppet khans of Janid origin. In 1785 Shah Murad formalized the family's dynastic rule (Manghit dynasty), and the khanate became the Emirate of Bukhara Modern History (1868—1991) Russian Vassalage (1868–1920) Russian Imperialism led to the Russian Empire's conquest of Central Asia during the late 19th century's Imperial Era. Between 1864 and 1885 Russia gradually took control of the entire territory of Russian Turkestan, the Tajikistan portion of which had been controlled by the Emirate of Bukhara and Khanate of Kokand ( from today's border with Kazakhstan in the north to the Caspian Sea in the west and the border with Afghanistan in the south). Tashkent was conquered in 1865 and in 1867 the Turkestan Governor-Generalship was created with Konstantin Petrovich Von Kaufman as the first Governor-General. The expansion was motivated by Russia's economic interests and was connected with the American Civil War in the early 1860s, which severely interrupted the supply of cotton fiber to the Russian industry and forced Russia to turn to Central Asia as an alternative source of cotton supply as well as a market for Russian made goods. The Russian regime in the 1870s attempted to switch cultivation in the region from grain to cotton (a strategy later copied and expanded by the Soviets). By 1885 Tajikistan's territory was either ruled by the Russian Empire or its vassal state, the Emirate of Bukhara, nevertheless Tajiks felt little Russian influence. Russian Empire, being a much bigger state with a huge population and having an advanced military, had little difficulty in conquering the regions inhabited by Tajiks, meeting fierce resistance only at Jizzakh, Ura-Tyube, and when their garrison in Samarkand was besieged in 1868 by forces from Shahr-e Sabz and the inhabitants of the city. The army of the Emirate of Bukhara was utterly defeated in three battles, and on 18 June 1868 Emir Mozaffar al-Din (r. 1860–1885) signed a peace treaty with the Governor-General of Russian Turkestan Von Kaufman. Samarkand and the Upper Zeravshan were annexed by Russia and the country was opened to Russian merchants. The emir retained his throne as a vassal of Russia and with Russian help he established control