The dissolution of the Soviet Union' was a process of systematic disintegration, which occurred in the economy, social structure and political structure. It resulted in the abolition of the Soviet Federal Government ("the Union center") and independence of the USSR's republics on 26 December 1991. The process was caused by a weakening of the Soviet government, which led to disintegration and took place from about 19 January 1990 to 26 December 1991. The process was characterized by many of the republics of the Soviet Union declaring their independence and being recognized as sovereign nation-states.