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4000 BCE
The Stone Age
Fire Levers, Languages, Transportation on Water, Stone Weapons -
1200 BCE
The Bronze Age
The Wheel, Writing, Agriculture, Metal Tipped Spears and Arrows, Leather Armor, Carts and Horses. -
500
The Iron Age
Keystone Arch, Saddles, seagoing Galleys, Scale Armor, Early Chemistry -
Jan 1, 1450
Agricultural Age
Steel Weapons, Mathmatics, Stirrups, Sailing Ships, Crossbows, Chainmail. -
Renaissance Age
Gunpowder, Printing, Fully-rigged ships, Hot air Balloons, Muskets, Warships -
Industrial Revolution
Mass Production, Steam power, Steam Ships, Railroads, Dynamite, Repeating Handguns, Direct Current Power. -
The World Wars
Cars, airplanes, radios, ocean liners, submarines, battleships, tanks, machine guns, fighter aircrafts, fission bombs, alternating currents, Hydroelectric Dams. -
Modern
Nuclear Energy, Computers, Lasers, Rockets, Jet aircrafts, Space Shuttles, Mag-lev Monorails, Hovercraft, Fusion Missiles, Kevlar, Organ Transplant.