The conversation between human and AI assistant.
Why is the United States divided into regions?
Are there any subregions within these main regions?
Yes, there are several subregions within each of the four main regions. For example, the Northeast region includes the New England and Mid-Atlantic subregions. The South region includes the Southeast and Southwest subregions. The Midwest region includes the Great Lakes and Plains subregions. And the West region includes the Mountain and Pacific subregions.