The nine regions that the census bureau has established within the united states are examples of Formal regions.
A formal region is a region that has officially recognized boundaries that define it. As such, formal regions often consist of city, county, state, and country boundaries. These areas are often considered well-known and their boundaries are determined by local or national governments.
Examples include the United States, Canada, France, Germany, and Thailand. Nation-states are formal regions because they are politically agreed upon, have political boundaries formally established, and are identifiable on maps.
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