Savoy-Sardinia basically conquered the rest of Italy in a relatively few years after local nationalists had weakened the despots. Prussia sort of did the same in Norths Germany , states that joined an alliances against it ceased to exist after the wars (the ones i feel worst about are Hanover, Hesse-Kassel, Frankfurt and Anhalt-Zerbst,), but it took centuries and they ran up against th e Southern and other unbreakable states. And this is probably irrelevant crap.