Between eras of multiple kingdoms and warlordism, Chinese dynasties have ruled parts or all of China. In some eras, control has stretched as far as Central Asia, Tibet and Vietnam. This Chinese imperialism began with the Qin Dynasty: in 221 BC, Qin Shi Huang conquered the various warring kingdoms and created the first Chinese empire. Successive dynasties in Chinese history developed bureaucratic systems that gave the Emperor of China direct control of vast territories.