The Japan Socialist Party (日本社会党, Nihon Shakai Tō), also known as the JSP, was a socialist political party in Japan that existed from 1945 to 1996. The party was founded by members of several former proletarian parties that existed before World War II, including the Social Mass Party, the Labour-Farmer Party, and the Japan Labour-Farmer Party.
The JSP was briefly in power from 1947 to 1948. From 1951 to 1955, the JSP was divided into the Left Socialist Party and the Right Socialist Party. In the same year, the two major conservative parties in Japan merged to form the Liberal Democratic Party (LDP), which established the 1955 System, and allowing the LDP to continuously hold power. The JSP was the largest opposition party but was incapable of forming a government. Nonetheless, the JSP managed to hold about one third of the seats in the National Diet during this period, preventing the LDP from revising the Constitution of Japan.
In the late 1980s and early 1990s, the JSP under the leadership of Takako Doi earned a record-high number of seats. Shocked by the establishment of new conservative parties, the party's seats in the National Diet decreased significantly in the mid-1990s, and the JSP was dissolved in 1996. Its successor is the Social Democratic Party, a minor party only holding four representatives in the National Diet as of 2020. There have been two JSP Prime Ministers of Japan, Tetsu Katayama and Tomiichi Murayama.
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