why is Washington DC. included in the southeast region?

Good question.

Geographically, it should be considered in the mid-Atlantic region. However, historically, it's south of the Mason-Dixon line, a line that at one time divided the south from the north. Also, D.C. was carved out of Virginia, a traditional southern state.

http://www.lib.utexas.edu/maps/united_states/united_states_pol02.jpg

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Washington, D.C. is not generally considered a part of the Southeast region of the United States. Instead, Washington, D.C. is recognized as a separate entity, referred to as the District of Columbia, which is not affiliated with any specific region.

However, it is worth noting that the definition of regions in the United States can vary depending on the context or purpose. In some instances, Washington, D.C. may be grouped with the states of Maryland and Virginia, given its proximity to these states and the historical, cultural, and economic ties.

If you encountered a source including Washington, D.C. in the Southeast region, it might be a specific categorization made for a particular reason or study. It's important to consider the source, context, and criteria used when assessing regional classifications.

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