dissolution (of something) the act of officially ending a marriage, a business agreement or a parliament; the act of breaking up an organization, etc. (Oxford)
2. the act or process of ending an official organization or legal agreement (Cambridge)
The company was set up following the dissolution of the Soviet Union. (Oxford)
After the dissolution of communist rule in 1989, things began to open up. (Cambridge)
dissolution of the Soviet Union
dissolution of communist rule in 1989
Disintegration
Disunion
Combination
Construction
Dissolution