Why did the western pact dissolve in 1991 a. the cold war had ended, so the soviet union no longer needed to manufacture nuclear weapons . b. the soviet union had fallen, so it no longer needed to govern its federation states . c. the berlin wall has been brought down , so the pact would no longer keep germany divided d. the countries of the communist bloc had separated from soviet union, so they no longer took part in the pact e. the cold war had ended so the united states and its allies were no longer depended on one another for military aid .