What a good way to start off my time on the forum. A suggestion regarding insurrection and rebellion.
The main idea is, obviously, allowing your fortress to rebel against it's founders.
You could only do so once you reach 100 population and have a duke/duchess. If you do so, you basically declare war on your founding civilization. If your monarch is in your fortress when you do so, he/she and her/his royal guard will leave the fortress, fighting their way out if necessary. And then the dwarf civ will start fighting you. Sending sieges and stuff. You can reach peace with their diplomat if you wish.
If you do rebel, not all dwarves will be happy. Dwarves who like social stability will oppose the rebellion and get an unhappy thought, and may tantrum or go nuts. But, anarchist dwarves will get a happy thought. Then, your duke/duchess will become your new civilization's monarch. (Your civilization is named after the founding group's name) Your new monarch can appoint generals and the like, as well as diplomats and liasons to reach peace and agreements with other civilizations. Dwarf caravans will come less often if you make peace, but will still come. Migrants don't really change, except noble migrants don't come. You can send out caravans during autumn to trade with other civilizations, although some civs *cough*goblins*cough* won't be happy to see them. You can also send out seven-man expedition teams to make new fortresses that you can switch to upon their founding. You send caravans to them in autumn to trade, accompanied by a liason, and occasionally (but not often) dwarves will leave your fortress and become migrants. Dwarves unhappy with your fortress have a higher chance of leaving. However, your fortresses can rebel, so be careful.
So, what do you think?