Nice strategic thought. I always use exterminate now to fix the "differing culture" problem and I have some overpopulated areas...

Has anyone else considered that these new cities would be kind of odd if repopulated by peasant units...a whole lotta men...and few women...and a lot of nervous livestock. I would think the poplulation growth rate would be a bit lower. A "working lady" could make some serious money by setting up shop there.