Why was the Warsaw Pact dissolved ?

the Warsaw Pact was an organization of Communist states in Central and Eastern Europe. the treaty was signed in Warsaw, Poland on May 14, 1955. the treaty was an initiative of the Soviet Union and was in direct response to West Germany joining the North Atlantic Treaty Organization (NATO) in 1955. as such, the Warsaw Pact was the Soviet-sponsored military-treaty organization and the European Communist Bloc's counterpart to NATO; it was similar to NATO in that there was a political Consultative Committee, followed by a civilian secretary-general, while down the chain of command there was a military commander in chief and a combined staff, although the similarities between the two international organizations ended there.