The municipal government existed in Warsaw until World War II and was restored in 1990 (during the communist times, the National City Council – ''Miejska Rada Narodowa'' – governed in Warsaw). Since 1990, the system of city administration has been changed several times – also as the result of the reform which restored ''powiat''s, cancelled in 1975. Finally, according to the ''Warsaw Act'', the city is divided into 18 districts and forms one ''city powiat'' with a unified municipal government.