Hi and sorry if this has been discussed recently, (though I scrolled through the wiki and googled without finding an active thread so I can use this as my excuse ). But I think we all have been in the situation, where we've been building a marvellous empire for the past 300 years (hmm. CCCP, USA, hmnmm.) and then either you or your vassals (or preferably both) just collapse. And I like the collapsing mechanic, I really do. It's just that there's no diplomacy or a global war in the modern era if the world is filled with grey states. So I got this idea: what if you could actually "manually" affect your vassal's stability. One could compere this to e.g. the actions of the Soviet Union in Eastern Europe during the cold war or to the Brittons and French trying to hold their empires together in the 50s. So my idea is, when your vassal is about to collapse / has suffered a terrible stability hit, you'd get a pop-up with some options: 1) Intervene military Use your military troops in the area to fight the revolutionaries, maybe cause some unhappines or bad relations but also improve your vassal stability. This would also increase the likelihood of you placing your own troops on vassal territory for strategic reasons, as often was the case historically. 2) Intervene economically Give your vassals financial aid, maybe pay some gold or gold per turn to increase their stability? For example, soviet union in east Germany. 3) Intervene politically (maybe, I don't know wheter this would work or not) Use espionage / great persons / something else to improve your vassal stability. 4) Leave them to be and your vassals might collapse or leave you alltogether. Also, the effects could become more drastic if your vassals are really trying to collapse. This way it becomes more expensive to keep your empire up and running if you really have some huge inner problems. Sorry if I was a bit unclear but I hope you go the idea I just like the idea of having a cold war kind of a situation withouth having all my vassals (hmm. Germany, Turkey) collapsing after I've won the war. This could probably help with the late game collapsing civs issue as well.