World Wars and the AtomWar & Conflict World War I 1914Turning point Industrial warfare kills about 20 million people and topples four empires. ▲ 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 → Habitual fire and cooking → Homo sapiens appears → Complex language → Natufian villages → Oldest known bread → Agriculture begins → Irrigation → Uruk and the first cities → Cylinder seals → Writing (cuneiform) → Babylonian mathematics → Babylonian astronomical diaries → Thales and natural philosophy → Trial and death of Socrates → Plato's Academy → Aristotle's Lyceum → Alexander's conquests → Alexandria founded → Library of Alexandria → House of Wisdom → Al-Khwarizmi and algebra → Fibonacci's Liber Abaci → Bills of exchange → Medici Bank → Double-entry bookkeeping → Muscovy Company → English East India Company → Seven Years' War → American Revolution → Declaration of Independence → French Revolution → Revolutions of 1848 → German unification → World War I Community notesLoading notes… Learn more ranked by votesDocumentbritannica.comWorld War I (Britannica) ↗Editor's pickBookBarbara W. TuchmanThe Guns of August ↗Editor's pickBookChristopher ClarkThe Sleepwalkers: How Europe Went to War in 1914 ↗Editor's pickVideoSearch on YouTubeOverSimplified World War 1 ↗Editor's pick