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Uchida was born in Fukuoka prefecture. He was the son of Shinto Muso-ryu practitioner Uchida Ryōgorō, and from an early age was interested in many forms of Japanese traditional martial arts, including kyudo, kendo, judo and sumo. In 1895, he attended the Toyogo University, where he studied the Russian language and in 1897, made a trip to Siberia.
As a youth, Uchida joined the Genyosha nationalist group, and soon became the leading disciple of its founder, Toyama Mitsuru. The Genyosha was active in raising funds and agitating for a more aggressive foreign policy towards the Asian mainland. When the Donghak Rebellion began in Korea in 1894, he went to Korea to help the rebels.
After his return to Japan, in 1901, he founded the Black Dragon Society, an ultranationalist society which advocated a strong foreign policy towards Russia and Japanese expansionism towards Korea and Manchuria. In 1903, he joined the Tairo Doshikai, a political group advocating war against Russia. After the successful conclusion of the Russo-Japanese War, he turned his attention towards advocating the annexation of Korea. He was one of the sponsors of the pro-Japanese Iljinhoe political party in Korea in 1907. During the 1920s and 1930s, he was active in attacking liberalism in Japanese society and politics. He was arrested in 1925 on suspection of planning the assassination of Japanese Prime Minister Takaaki Kato & the Emperor of Japan, Emperor Yoshihito, but was found innocent.
- Matsui, Kenji (1993) The History of Shindo Muso Ryu Jojutsu, translated by Hunter Armstrong (Kamuela, HI: International Hoplological Society) #1
- Beasley, W.G. (1991). Japanese Imperialism 1894-1945. Oxford University Press. ISBN 0-19-822168-1.
- Beasley, W.G. (2000). The Rise of Modern Japan, 3rd Edition: Political, Economic, and Social Change since 1850. Palgrave Macmillan. ISBN 0-312-23373-6.
- Duus, Peter (1998). The Abacus and the Sword: The Japanese Penetration of Korea, 1895-1926. University of California Press. ISBN 0-520-21361-0.
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