Why So Many East Coast Cities Were Built at Waterfalls

Why were so many East Coast cities built at waterfalls? Richmond, Baltimore, and Augusta all sit on the fall line, an invisible step in the rock where rivers drop and ships coming from the sea could go no farther. In 1790, five of America's 24 urban places stood on it, and together they held about one in four of the people living in those places. Watch next: the same barrier-and-battery idea at the Mississippi's only waterfall, Why the Mississippi's Only Waterfall Is Made of Concrete:    • Why the Mississippi's Only Waterfall Is Ma...   Chapters 0:00 Where the Ships Turned Back 0:46 The Step Hidden in the Rock 2:04 Where Cargo Changes Hands 3:47 A Waterfall Is a Battery 5:31 Can You Beat a Waterfall? 7:02 The Machine That Ignored Rivers 8:01 Is the Line Still Working? 8:22 The Secret, Solved Our calculation: the five places named in the 1894 USGS report held 51,362 of the 201,655 people living in the 24 urban places counted in 1790 (25.5 percent). The 1894 list names pioneer settlements; it is not a complete list of fall line cities. Sources USGS, Weems (1998), Open-File Report 98-374: https://pubs.usgs.gov/of/1998/0374/re... USGS, Darton (1894), Fredericksburg folio: https://pubs.usgs.gov/publication/gf13 U.S. Census Bureau, Population of the 24 Urban Places: 1790: https://www2.census.gov/library/worki... SCDOT Geotechnical Design Manual, Ch. 11: https://www.scdot.org/business/pdf/ge... National Park Service, Great Falls Park: https://www.nps.gov/grfa/learn/nature... National Park Service, The Patowmack Canal: https://www.nps.gov/grfa/learn/histor... National Park Service, Who built the Potomac Canal?: https://www.nps.gov/grfa/learn/histor... National Park Service, Georgetown Waterfront: https://www.nps.gov/thingstodo/explor... National Park Service, Richmond's Indigenous heritage: https://www.nps.gov/tripideas/richmon... National Park Service, Canal Trail at James River: https://www.nps.gov/places/canal-trai... National Park Service, Augusta Canal: https://home.nps.gov/places/augusta-c... National Park Service, Tredegar Time Line: https://www.nps.gov/rich/learn/histor... National Park Service, Baltimore and Ohio Railroad: https://www.nps.gov/places/000/baltim... New Georgia Encyclopedia, Fall Line: https://www.georgiaencyclopedia.org/a... Encyclopedia Virginia, Christopher Newport: https://encyclopediavirginia.org/entr... DC Water, Drinking water: https://www.dcwater.com/about-dc-wate... U.S. Department of Energy, How Hydropower Works: https://www.energy.gov/cmei/water/how... Other references (no links): ASCE Civil Engineering magazine (April 2021), New Georgia Encyclopedia entries on Columbus, Chattahoochee River, and Atlanta; U.S. Army Corps of Engineers, Washington Aqueduct. Source credits also appear on screen. Archival images, all public domain, credited on screen: Library of Congress, Historic American Engineering Record (HAER VA-13, VA-32, VA-34, GA-5, GA-19, GA-22, GA-25, GA-70, SC-40, DC-WASH-691) and Historic American Buildings Survey (HABS DC-GEO-25); other Library of Congress prints (Kollner, 1839; Bartlett/Dick, 1842; 1909); John Smith, A Map of Virginia (1612); NASA ISS crew photo ISS013-E-13549. Map data: Natural Earth, USGS, and U.S. Census Bureau (all public domain). Music: YouTube Audio Library. "Spaghettification", "Frame-Dragging", and "Laniakea" by The Grey Room / Density & Time. Narration: AI-generated voice (Kokoro TTS). It does not imitate any real person. Research, script, and graphics were prepared with AI assistance; maps and diagrams are graphics built from the public data above. #FallLine #Geography #EconomicGeography