tjs282
Stone \ Cold / Fish
If you're talking about getting the "Not enough citizens to complete this build!" pop-up when completing a Settler (or Worker), then choosing "Abandon city" will destroy the town, and give you a Settler (or Worker).What happens with a Pop=1 town when you click on "Abandon City"? Haven't tried it yet.
If you right-click on a town and then choose "Abandon city", you're left with nothing but ruins. So I generally don't do that!