Gnarfflinger said:
When you build the UN, your Vassal States will vote your way on UN votes. I rode that to a Diplomatic win...
Thank you!
Ok here's my experience with vassals so far. If you take a nation's capital, you'll often find them willing to capitulate. By doing this, I was able to get Alexander who still had 5 towns remaining, while razing only two towns (one was a 1-2 pop town, the other was just too far away for me to take it without getting a wonder) and capturing his capital. Overall, that was a much better deal than I got with Shaka and Caesar.
With Shaka, he wouldn't speak to me for 10 turns after I declared war on him. At least I'm guessing that's how long the AI waits before they speak to you again. Anyway, by that time, I had left most of his country in ashes. I believe I razed 5 towns, and he had two remaining when he was willing to capitulate. I'm wondering now whether I should have let him do it. With Caesar, I didn't know about the capital thing. I just ravaged his outlying towns until he was down to three or so, and then he begged for mercy.
At this point, I have the remaining three nations as my vassals. Because they all capitulated, none will be able to leave this position until someone gets 50% as much land and population as me. They're all well under my thumb. As long as I keep my population and territory twice as high as my recovering enemies, I'll be ok. At first, I was concerned I'd have to wait until 2050 to end the game. Thanks to your post, I have a better idea.
One thing I'd like to note though: I only control about 75% of the world population. That should be my population plus 50% of my vassals' population. That's still more than enough to get a diplomatic victory, but you don't get the entire population of the enemy.
Edit: Actually, I gave it one more turn after I accepted Shaka as a vassal, and I won a conquest victory. I like vassals now. There's nothing wrong with saving some time/soldiers, and getting a punching bag for the enemy while you're at it. I now realize it was a mistake not to accept Ragnar's and Stalin's capitulation, and not a mistake to have allowed Shaka's.