- **Date of Independence:** July 16, 1790 (federal district established from land ceded by [[Maryland]] and [[Virginia]]) - **Date of Annexation to [[United States of America (USA)]]:** N/A (federal district, not a state) - **Population (2025):** 702,000 - **GDP (2025):** $165 billion - **Largest City:** N/A (entire district is one city) - **State Capital:** Is the U.S. capital - **Historical Note:** Planned capital city designed by Pierre L'Enfant, built on land donated by Maryland and Virginia. Seat of federal government since 1800. Home to iconic monuments, Smithsonian museums, and all three branches of government. Has highest population density in the U.S. and highest GDP per capita.