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Commodore Matthew C. Perry sailed into Tokyo with nine ships in March 1854 and forced Japan to enter into trade with the United States... Russia, Britain, France, and Holland used their fleets on several occasions to defeat and disarm the Japanese feudal domains that defied them. The Black Dragon Society (Kyūjitai; 黑龍會; Shinjitai: 黒竜会, kokuryūkai), or the Amur River Society, was a prominent paramilitary, ultranationalist group in Japan. The Kokuryūkai was founded in 1901 by martial artist Uchida Ryohei as a successor to his mentor Mitsuru Tōyama's Gen'yōsha. The purpose of the organization was to keep the Russian Empire North of the Amur River and out of East Asia. Japan was attacked first.