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Adnan Menderes, alongside Celâl Bayar, founded Turkey's Democrat Party in 1946, introducing a multi-party system and challenging the dominance of the Republican People's Party. Menderes served as Turkey's Prime Minister from 1950 to 1960, implementing liberal economic policies, promoting infrastructure development, and improving relations with the West. His government's suppression of political dissent and eventual military overthrow in 1960 tarnished his legacy.