My Knowledge Base

Timeline

Guns, Germs & Steel — Master Timeline

Deep Prehistory

  • ~7 MYA — Human and ape lineages split in Africa. Australopithecus — bipedal, small-brained, no tools.
  • ~2.5 MYA — Genus Homo appears in Africa. First stone tools (Oldowan choppers). Tools barely change for 1M+ years.
  • ~1–2 MYA — Homo erectus leaves Africa → reaches Java (“Java Man”) and China (“Peking Man”). Acheulean hand-axes. Never crosses water barriers to reach Australia or Americas.
  • ~700,000–200,000 YA — Homo heidelbergensis — likely common ancestor of Neanderthals and Homo sapiens. Lived in Africa and Europe.
  • ~300,000–50,000 YA — Denisovans in Asia (discovered 2010, not in Diamond’s book). Interbred with Homo sapiens. Modern Melanesians carry ~3–5% Denisovan DNA.
  • ~130,000 YA — Neanderthals dominate Europe/western Asia. Brains equal or larger than ours, stocky cold-adapted bodies, Mousterian flake tools. No art, no jewelry, no bone tools, no innovation.
  • ~100,000 YA — Anatomically modern Homo sapiens appear in Africa. Tools barely better than Neanderthals’. Modern body ≠ modern behavior.

The Great Leap Forward & Global Expansion

  • ~50,000 YA — The Great Leap Forward. Sudden explosion: cave art (Lascaux, Altamira), jewelry, bone tools, music (bone flutes), long-distance trade, burials with grave goods, fishing, seasonal migration. Most likely cause: evolution of fully modern language.
  • ~40,000+ YA — Humans colonize Australia/New Guinea (then joined as Sahul). World’s first seafarers cross 8+ ocean channels, some 60+ miles wide. Megafauna wiped out within thousands of years — giant kangaroos, rhino-sized Diprotodon, 20-ft Megalania lizards, marsupial lions. Australia left with zero domesticable large animals.
  • ~40,000–50,000 YA — Modern humans enter Europe. Encounter Neanderthals.
  • ~30,000 YA — Neanderthals go completely extinct. First recorded replacement of one human population by another.
  • ~14,000 YA — Humans reach the Americas via Beringia land bridge (Siberia → Alaska). Spread to Patagonia within ~1,000 years. ~80% of large mammals go extinct — mammoths, mastodons, native horses, native camels, giant ground sloths, saber-toothed cats, American lions, dire wolves, car-sized glyptodonts, short-faced bears.

Agricultural Revolutions (11,000–3,000 BC)

  • ~8500 BC — Fertile Crescent (Middle East): wheat, barley, peas, lentils domesticated. Sheep, goats, cattle, pigs follow. Earliest and most important agricultural revolution on Earth. Best package of crops AND animals.
  • ~7500 BC — China (north/Yellow River): millet domesticated. Soybeans, hemp, silkworms.
  • ~7500 BC — China (south/Yangtze): rice domesticated. Pigs, water buffalo, ducks, chickens.
  • ~7000 BC — New Guinea: taro, bananas, yams domesticated independently. But no cereals and no animals — limits future development.
  • ~6500 BC — Fertile Crescent crops reach Greece and Balkans — spreading west along the east-west axis.
  • ~6000 BC — Fertile Crescent crops reach Egypt/Nile valley. Stopped at the Sahara — can’t cross into tropical sub-Saharan Africa.
  • ~6000 BC — Fertile Crescent crops spread east to Iran and Central Asia.
  • ~5000 BC — Sahel (West Africa): sorghum, pearl millet domesticated independently. Africa’s own agricultural revolution.
  • ~5000 BC — Fertile Crescent crops reach Western Europe and the Indus Valley.
  • ~4000–3000 BC — Austronesians (farmers displaced from southern China by expanding Han) cross to Taiwan. Bring rice, millet, pigs, chickens, dogs, pottery, advanced sailing technology.
  • ~4000 BC — Fertile Crescent crops reach Britain.
  • ~3500 BC — Mesoamerica: corn (maize), beans, squash domesticated. Corn extremely difficult to breed from wild teosinte — takes thousands of years. No large domesticated animals.
  • ~3500 BC — Andes: potatoes, quinoa domesticated. Llama and alpaca domesticated — the only large domesticated animals in the entire Americas. Can’t be ridden, can’t pull plows.
  • ~2500 BC — Eastern U.S.: sunflower, goosefoot domesticated. Minor center — later replaced by Mesoamerican crops.

Writing, States & Early Expansions (3500–500 BC)

  • ~3400 BC — Sumerians invent writing (cuneiform) in the Fertile Crescent. Begins as accounting tokens → pictographs → abstract symbols. Writing invented independently only a handful of times in all of human history.
  • ~3000 BC — Austronesian expansion begins: Taiwan → Philippines. Beginning of the greatest maritime expansion in history.
  • ~3000 BC — Bantu expansion begins from Nigeria/Cameroon. Farmers with sorghum, millet, iron tools start moving south and east across sub-Saharan Africa.
  • ~3000 BC — Egyptian hieroglyphics develop. Possibly independent or inspired by awareness of Sumerian writing.
  • ~2500 BC — Austronesians reach Indonesia and Borneo. Indigenous hunter-gatherers almost entirely displaced — only tiny Negrito remnant populations survive (Aeta in Philippines, Andaman Islanders).
  • ~2500–1500 BC — Han Chinese farmers expand south, displacing Tai, Miao-Yao, Austroasiatic, and Austronesian peoples from southern China. These displaced peoples become the ancestors of Thai, Hmong, Khmer, and all Austronesian-speaking peoples.
  • ~1700 BC — The alphabet invented — only once, by Semitic peoples near the Fertile Crescent. Every alphabet on Earth descends from this single invention. Revolutionized literacy — made reading/writing accessible beyond specialist scribes.
  • ~1600 BC — Austronesians reach coastal New Guinea and Melanesian islands (Lapita culture, identified by distinctive pottery). Cannot penetrate inland — indigenous New Guinean farmers already too dense.
  • ~1300 BC — Chinese oracle bone script — possibly independent invention of writing.
  • ~1200 BC — Austronesians reach Fiji, Tonga, Samoa. Gateway to Polynesia — first humans ever on these islands.
  • ~600 BC — Maya/Zapotec develop writing independently in Mesoamerica. Never spreads to the Andes or North America.
  • ~500 BC — Ethiopian Ge’ez script develops — one of the few independent African writing systems. Still used today for Amharic.

Classical Era & Great Expansions (500 BC – 500 AD)

  • ~300 BC–1200 AD — Ghana Empire in West Africa — controls trans-Saharan gold trade.
  • 221 BC — Qin dynasty unifies China for the first time. Standardized writing, weights, measures. China stays mostly unified afterward — geography (connected river plains, few internal barriers) favors it. Europe, with Alps/Pyrenees/seas, stays fragmented.
  • ~500 AD — Austronesians reach Hawaii (2,400 miles north into open Pacific) and Easter Island (2,200 miles east — most remote inhabited island on Earth). Navigation entirely by stars, wave patterns, bird flight, cloud formations.
  • ~500 AD — Austronesians reach Madagascar from Indonesia — a staggering 4,000-mile open ocean crossing to an island off Africa. Madagascar’s language (Malagasy) is Austronesian, not African.
  • ~300–500 AD — Bantu expansion reaches southern Africa. Western route (through rainforest, enabled by bananas acquired from Austronesian traders) and eastern route (through East African highlands) converge. Pygmies pushed into deep rainforest. Khoisan pushed to Kalahari/Cape. Both routes took ~3,500 years from Nigeria.

Medieval Period (500–1500 AD)

  • ~1100 AD — Cahokia (near modern St. Louis) peaks at 10,000–20,000 people — largest settlement north of Mexico. Massive earthen mounds rivaling Egyptian pyramids in volume.
  • ~1100–1450 AD — Great Zimbabwe built — massive stone structures without mortar. Trade center connecting interior gold to Indian Ocean commerce.
  • ~1200 AD — Austronesians reach New Zealand — last major habitable landmass settled by humans. Polynesian expansion complete.
  • ~1235–1600 AD — Mali Empire rises. Timbuktu becomes center of Islamic scholarship.
  • 1324 AD — Mansa Musa’s hajj to Mecca — distributes so much gold along the way he destabilizes economies from Cairo to Medina. Possibly the richest person in history.
  • 1433 AD — Chinese emperor bans construction of oceangoing ships, ends Zheng He’s treasure fleet voyages (which had reached East Africa with ships far larger than anything in Europe). One decision turns China inward. In Europe’s fragmented political landscape, no single ruler could make such a decision stick — if one king banned ships, his rivals kept sailing. Competition drove Europe forward; unity held China back.
  • ~1464–1591 — Songhai Empire — largest empire in African history at its peak.

The Collisions (1492–1900)

  • 1492 — Columbus reaches the Americas. European diseases begin spreading — smallpox, measles, influenza devastate populations with zero immunity. The most consequential year in post-Ice Age history.
  • 1519–1521 — Cortés conquers the Aztec Empire. Captures Montezuma. Smallpox kills far more Aztecs than Spanish swords.
  • 1532 — Pizarro captures Inca emperor Atahuallpa at Cajamarca. 168 Spaniards vs. ~80,000 Inca. Guns, steel armor, horses, and disease vs. stone/bronze weapons and zero immunity. ~7,000 Inca killed, zero Spaniards. Atahuallpa pays history’s largest ransom (rooms filled with gold and silver) — executed anyway. Inca Empire, dependent on centralized command, collapses.
  • 1500s–1800s — ~95% of Native American population killed by European epidemic diseases — smallpox, measles, influenza, typhus, plague. The single most devastating factor in the European conquest of the Americas. Entire civilizations gutted before European armies even arrived.
  • 1788 — British colonization of Australia begins. Aboriginal Australians — no farming, no metal, no domestic animals, no immunity — rapidly dispossessed. Smallpox spreads ahead of the frontier, killing people who had never seen a European.
  • 1821 — Sequoyah completes the Cherokee syllabary — inspired by the concept of European writing, creates an entirely new system without being able to read English. Cherokee literacy rates surpass surrounding white settlers within years. Proof that the “idea” of writing can be borrowed even when the system cannot.
  • 1835 — 900 Maori from New Zealand attack 2,000 Moriori on Chatham Islands. Moriori offer peace (their cultural tradition). Maori slaughter hundreds, enslave the rest. Both peoples descended from the same Polynesian ancestors just centuries earlier — environment alone drove their divergence into a warrior society and a peaceful one.
  • 1884–85 — Berlin Conference. European powers carve Africa into colonies with lines on a map — no African representation. Full colonization of Africa comes 350+ years after the Americas, delayed because: (a) tropical diseases killed Europeans (malaria, yellow fever — “the white man’s grave”), (b) Africans had iron weapons and organized states, (c) Africans had partial immunity to Old World diseases. Finally enabled by quinine (anti-malarial), the Maxim gun (first machine gun), and steamships.

Diamond’s Core Thesis — The Chain

Geography & ecology of continent → domesticable plants & animals → food production & surplus → dense populations → epidemic diseases (from livestock) + writing + technology (guns, steel) + political organization (states, armies) → conquest of peoples who lacked these advantages.

The winners weren’t smarter. They were luckier — born on continents with the right plants, the right animals, the right axis, and the fewest barriers. That’s the answer to Yali’s question.