📘 A capital drawn at the last navigable water

What you’ll learn

1. Fall line and riversRead Washington from the air through Fall Line geography and the Potomac–Anacostia fork.Ship navigation and two rivers set where the capital could stick before any street existed.
2. Drawing the capitalTrace the 1790 bargain, L'Enfant's plan, an unfinished 1800 move, and the 1814 fire.A capital was drawn on paper, built under deadline, burned, and rebuilt on the same hill.
3. Monument and MallConnect the Mall cleanup, Washington Monument stump, Tidal Basin, and height law to what you see.Twentieth-century cleanup and statute shaped the lawn, needle, pond, and low skyline.
4. Reading the plan todayUse retrocession, aerial views, and open questions to read Washington as a deliberate plan.The missing diamond corner and visible axes still record geology, politics, and design choices.

Questions this course answers

Grounded in trusted sources

• Residence Act of 16 July 1790, 1 Stat. 130 — Library of Congress (a district of territory not exceeding ten miles square, on the river Potomac, at some place between the mouths of the Eastern Branch and the Connogochegue; Philadelphia the temporary seat; offices to cease elsewhere after the first Monday in December 1800)
• Library of Congress — Residence Act: Primary Documents (passed 16 July 1790; permanent capital on the Potomac; Philadelphia temporary for ten years; compromise among Jefferson, Hamilton, and Madison: southern capital in exchange for federal assumption of state debts)
• U.S. Senate — About Congressional Meeting Places: Washington, DC (Washington chose the land where the Potomac met the East Branch, today the Anacostia; Maryland and Virginia ceded land including Georgetown and Alexandria; L’Enfant’s grid with radiating boulevards; Congress House on Jenkins Hill; Pennsylvania Avenue connecting the Capitol to the President’s mansion; a grand avenue west from the Capitol; commissioners named the city Washington and the district the Territory of Columbia; Washington dismissed L’Enfant after he clashed with the commissioners; enslaved labor hired from local slaveowners; Congress moved in 1800 with the Capitol incomplete; British attack 1814 destroyed most federal buildings; Congress considered leaving; February 1815 appropriations to rebuild; filling in of the long-neglected Washington Canal; Alexandria and Alexandria County returned to Virginia; McMillan / Senate Park Commission plan of 1902 for a grassy Mall from the Capitol to a Lincoln memorial)
• Architect of the Capitol — History of the U.S. Capitol Building; U.S. Capitol Building FAQ (cornerstone 18 September 1793, laid by President Washington; Congress first met in the Capitol 17 November 1800)
• U.S. Senate — The Senate Moves to Washington (17 November 1800, first meeting in the Capitol after ten years in Philadelphia)
• U.S. House of Representatives — Historical Highlights (in 1800 only the north wing was complete enough to receive Congress)
• U.S. Geological Survey — The River and the Rocks: The Geologic Story of Great Falls and the Potomac River Gorge (Piedmont hard rock to Coastal Plain soft sediment; Fall Line is the head of navigation for oceangoing ships; Great Falls about 15 miles upstream of the Fall Line, in the Piedmont; river reaches approximately sea level at Chain Bridge; under Arlington Memorial Bridge the river leaves the Piedmont and enters the Coastal Plain; from Washington to Point Lookout the Potomac occupies a drowned valley, tidal and navigable by oceangoing ships)
• Encyclopaedia Britannica — fall line (eastern U.S. fall line between Piedmont and Atlantic Coastal Plain; cities include Trenton, Philadelphia, Baltimore, Washington, Richmond, Augusta)

Every Wunder lesson is built from real, reputable sources — never invented.

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