The Declaration stated the reasons necessitating the formation of a union between all existing Soviet republics into one united socialist state and expressed willingness to undertake a 'permanent revolution', exporting the Socialist Revolution to other states, primarily in the West, as evidenced by the recent Polish-Soviet War. The Declaration also stressed that the creation of the Union of the Soviet Socialist Republics was a voluntary union of peoples with equal rights, whereby each Soviet republic retained the right to freely secede from the Union, a provision that was used as the legal basis for the independence of several republics and the subsequent dissolution of the Union in 1991.