Irish political party. Its main aim was to create a united republican Ireland, politically and economically independent of Britain. Eamon de Valera founded the Party in 1926 from opponents of the Anglo-Irish Treaty (1921), which established the Irish Free State. The Party won control of the government (1932). It dominated Irish politics for the following decades, being out of office only for short periods. In 1973 it lost to an alliance of the Fine Gael and the Labour Party, but returned to power from 1977 to 1981, in 1982, and again from 1987 to 1994 and from 1997.