(Ha! When the Alerts dragged me into this thread, I thought it was going to be about the legal drama Damages with Glenn Close.

)
http://memory-alpha.wikia.com/wiki/Treaty_of_Algeron
In 2311, the Romulan Star Empire got it's ass handed to it so well by the federation that LOGICALLY the Romulan Empire should have been assimilated, and the Romulan people should have all been converted into third class slaves mopping corridors and shit.
DO YOU KNOW HOW MUCH WORK THAT INVOLVES!
(Keeping your foot on 60 trillion throats.)
Julius Caesar went grey trying to keep the Gauls believing that they were Roman. Seriously every 50 years they had to invade and reinvade because the grandchildren of the last lot of Gauls who got invaded didn't quite believe that Rome was a real thing and not a boogy man fairystory.
"We have your nuts over a barrel, pull back, make your new borders here, here and here, dismantle your expeditionary military, defense is fine, you share a massive border with the Klingons and we have no intention of defending you from them, but this all seems fair, we all pretend it's peace time, and that we don't hate each other, and in return, we don't execute every Romulan (male) over the age of ten."
"No."
"Well I guess we're going on a crusade, and we're not going to stop till there's a few trillion of you green blooded shits diced into chunks."
"Cloaking devices."
"Say what now?"
"I can't sell a loss to my people, they'll string me up and start raising private armies to strike back at the Federation. We are petty and we are horrible. You have to make it look like we won, even though I'm more than happy to surrender. Cool?"
"Cloaking devices?"
"If you promise to abandon the technology and never look into at all, I can sell this to the senate as a colossal victory, hells, I can even say that once you admit that you don't have a cloaked fleet somewhere, that the Klingons are likely to murder the lot of you while you're sleeping."
"But we don't use cloaking devices."
"Exactly, so you won't mind not using them."
"But we arn't using them."
"Which seems like a lot of effort on your part, so we appreciate it, a lot."
"To stop using tech that we don't use."
"Do you want a quiet neighbour, or do you want to be kept up all night by the sound of knives sharpening?"
"No cloaks for us. Signed in blood."
"Peace in our time."