This single source is a comprehensive Wikipedia article detailing Washington, D.C., officially known as the District of Columbia. The text outlines the city's founding, history, and political status as the United States' capital and a federal district not belonging to any state. Key sections of the article cover the city's geography, demographics (including racial composition changes and population growth), and robust economy, which is heavily influenced by the federal government and tourism. Furthermore, the source provides extensive details on the city's culture, arts, cuisine, museums, urban design (including the L'Enfant Plan and height restrictions), and infrastructure and transportation systems.