Why does the capital of columbia, bogota dc, and the capital of us, washington dc, both have "dc"?

Compose a three-paragraph essay that puts forth an argument about the impact of population growth on the united states. as you write, be sure to include the following sections: an introduction that includes a topic sentence or paragraph that incorporates your argument a clearly stated argument that you will defend at least seven specific facts from the information you analyzed or found in your research for this activity an appropriately formal tone transitions good grammar and proper spelling references to your research in your writing, including direct quotes and appropriate citations a concluding statement or paragraph that incorporates your argument