The Federation signed a peace treaty with the Dominion, and the Female Changeling was taken as a prisoner of war. Every episode of Star Trek: Voyager, after Relativity, was after the Dominion War. Shinzon murdered the Romulan Senate, became Praetor, and tried to destroy Earth. Data died to stop him. A few years later, Romulus was destroyed by a super nova, and Spock and Nero travelled back in time. It is unknown what happened to the Klingons or the Breen, or if Cardassia was able to recover from the Dominion's attack on their planet.