How do I retire a Nation?

Click the cog next to a Nation you're an Admin of to reach the Settings page:

nation_cog.jpg

On the Settings page, click 'Retire Nation' on the left side:

retire_nation.jpg

Click it and you'll see a confirmation screen telling you this action is permanent and it can not be undone.

Also, if you're the only member of a Nation and you leave it, you'll see a confirmation screen telling you the Nation will be closed if you leave and it can not be undone.