Regions are where nations reside. They also host multiplayer communities and organizations.
New nations start out in a feeder region (These ones).
Nations can move between regions. When you are on a region page, click "Move [your nation] to [region]".
Any nation can create a region. (Try it!)
The founder of a region has absolute power over their region, including the ability to eject other nations.
IMPORTANT: You are only allowed one nation at a time in the World Assembly.
The World Assembly (WA) is like the UN. Member nations vote on legislation in the General Assembly and Security Council.
WA members in the same region can endorse each other.
The nation with the most endorsements in a region becomes the WA delegate of that region.
WA delegates have administrative control over regions that have no founder.
Raiding organizations invade regions by entering and capturing the delegate position.
The WA delegate of a region may place a password to limit entry, either as a defense or to cement control.
(official site resource)