I've had something like this happen to me. But my galaxy looked something like two seperate organizations of alliances. On the left, Terran, Altarian, Torian etc. Right, Drengin, Yor, Arcean, etc. Something like that. It's peaceful for some months or so, until an assassination event comes along. Everyone, and I truly mean everyone, got into a war or two.
A glorious game that left me giddy for days.
Anyway, have fun with your current galaxy. Wading through those hundred of Vengence ships!