The area which is Mongolia has been ruled by various nomadic empires. This was until the great 'Mongol Empire' was founded by Genghis Khan in 1206. After the Yuan Dynasty collapsed, the Mongols became nomads again. After the 16th century, Mongolia were influenced by Tibetan Buddhism. By the end of the 17th century, most of Mongolia was part of an area ruled by the Qing Dynasty. When the Qing Dynasty collapsed in 1911, Mongolia declared independence. But they had to fight against the Chinese. They were helped by the Soviet Union. In 1921, the world accepted its independence. Shortly after the death of Bogd Khaan, the last monarch of Mongolia the monarchy was replaced by a communist government in 1924, and the country was renamed the Mongolian People's Republic. Up until the fall of the Soviet Union, Mongolia was a satellite state for the Soviets. The Mongolian Red Cross Society was set up in 1939. It has its headquarters in Ulaanbaator.