Industrial AgeWar & Conflict U.S. Civil War 1861Turning point The deadliest war in U.S. history, fought over slavery and union. ▲ MattersSaveShareTrace roots Longest chain: The Big Bang → First stars ignite → Supernovae seed heavy elements → The Sun forms → Earth forms → First oceans → First life → Photosynthesis evolves → Great Oxidation Event → Complex cells (eukaryotes) → Multicellular life → First animals → Cambrian Explosion → First vertebrates → Jawed fish → Fish walk onto land → The amniotic egg → The Great Dying → Dinosaurs appear → Asteroid ends the dinosaurs → Early primates → Apes split from monkeys → Human line splits from chimpanzees → Walking upright → First stone tools → Genus Homo appears → Homo erectus → Control of fire → First fired clay figures → First pottery → Potter's wheel → The wheel → Spoke-wheeled chariot → Hittite Empire → Iron Age begins → Rome founded (traditional date) → Roman Republic founded → Caesar crosses the Rubicon → Roman Empire begins → Jesus of Nazareth crucified → Paul spreads Christianity → Edict of Milan → Constantinople founded → Roman Empire permanently divides → Fall of the Western Roman Empire → Feudalism → Magna Carta → De Montfort's Parliament → English Civil War → Hobbes' Leviathan → Locke's Two Treatises of Government → Declaration of Independence → U.S. Constitution → U.S. Civil War Community notesLoading notes… Learn more ranked by votesBookJames M. McPhersonBattle Cry of Freedom ↗Editor's pickVideoSearch on YouTubeAmerican Civil War documentary ↗Editor's pick