None

Advance	Requires	Leads to	Allows	Ends use of
Advanced Flight	Flight, Electricity	Rocketry	Bomber, Aircraft Carrier
Alphabet	None	Code of Laws, Mapmaking, Mathematics, Writing	None	None
Astronomy	Mysticism, Mathematics	Navigation, Theory of Gravity	Copernicus' Observatory	None
Atomic Theory	Theory of Gravity, Physics	Nuclear Fission	None	None
Automobile	Combustion, Steel	Mass Production	Armor	Copernicus' Observatory, Knights
Banking	Trade, The Republic	Industrialization, The Corporation	Bank	None
Bridge Building	Iron Working, Alphabet	Railroad	Road on river squares	None
Bronze Working	None	Currency, Iron Working	Phalanx, Colossus	None
Ceremonial Burial	None	Monarchy, Mysticism	Temples	None
Chemistry	University, Medicine	Refining, Nuclear Power	None	None
Chivalry	Feudalism, Horseback Riding	None	Knight	Chariots
Code of Laws	Alphabet	Monarchy, Trade, Literacy, The Republic	Courthouses	None
Combustion	Refining, Explosives	Flight, Automobile	Cruisers	Ironclads, Barracks
Communism	Philosophy, Industrialization	Labor Union	United Nations	Pyramids, Michelangelo's Chapel
Computers	Mathematics, Electronics	Space Flight, Robotics	SETI program	None
Conscription	The Republic, Explosives	None	Riflemen	Legions, Musketeers
Construction	Masonry, Currency	Engineering, Bridge Building	Fortresses, Aqueducts, Colosseums	None
The Corporation	Banking, Industrialization	Mass Production, Genetic Engineering, Refining	None	None
Currency	Bronze Working	Trade, Construction	Marketplaces	None
Democracy	Philosophy, Literacy	Recycling	None	None
Electricity	Magnetism, Metallurgy	Electronics, Advanced Flight	None	Colossus
Electronics	Electricity	Computers, Rocketry, Nuclear Power	Hoover Dam, Hydroplants	Shakespeare's Theatre
Engineering	The Wheel, Construction	Electronics, Invention	None	None
Explosives	Gunpowder, Chemistry	Combustion, Conscription	None	None
Feudalism	Masonry, Monarchy	Chivalry	None	None
Flight	Combustion, Physics	Advanced Flight	Fighter	None
Fusion Power	Nuclear Power, Superconductor	Future Tech	None	None
Future Tech	Fusion Power	More Future Tech	None	None
Genetic Engineering	Medicine, The Corporation	None	Cure for Cancer	None
Gunpowder	Invention, Iron Working	Metallurgy, Explosives	Musketeers	Barracks, Militia, Phalanx, The Great Wall
Horseback Riding	None	Chivalry	Cavalry	None
Industrialization	Railroad, Banking	Steel, The Corporation, Communism	Women's Suffrage, Transports, Factories	Frigates
Invention	Engineering, Literacy	Steam Engine, Gunpowder	None	Hanging Gardens
Iron Working	Bronze Working	Bridge Building, Gunpowder	Legions	None
Labor Union	Mass Production, Communism	None	Mech Infantry	None
Literacy	Writing, Code of Laws	Democracy, Invention, Philosophy, The Republic	The Great Library	None
Magnetism	Navigation, Physics	Electricity	Frigates	Sail, The Lighthouse
Mapmaking	Alphabet	Navigation	Triremes, The Lighthouse	None
Masonry	None	Mathematics, Feudalism, Construction	The Great Wall, Pyramids, Palace, City Walls	None
Mass Production	Automobile, The Corporation	Nuclear Fission, Superconductor, Recycling, Labor Union	Submarines, Mass Transit	None
Mathematics	Alphabet, Masonry	Astronomy, Physics, University, Computers	Catapults	None
Medicine	Philosophy, Trade	Chemistry, Genetic Engineering	Shakespeare's Theatre	None
Metallurgy	Gunpowder, University	Steel, Electricity	Cannons	None
Monarchy	Ceremonial Burial, Code of Laws	Feudalism	None	None
Mysticism	Ceremonial Burial	Astronomy, Philosophy	Oracle	None
Navigation	Mapmaking, Astronomy	Physics, Magnetism	Magellan's Expedition, Sail	Triremes
Nuclear Fission	Mass Production, Atomic Theory	Nuclear Power	Manhattan Project	Isaac Newton's College
Nuclear Power	Nuclear Fission, Electronics	Fusion Power	Nuclear Plants	None
Philosophy	Mysticism, Literacy	Medicine, Democracy, University, Religion, Communism	None	None
Physics	Mathematics, Navigation	Atomic Theory, Magnetism, Steam Engine, Flight	None	None
Plastics	Refining, Space Flight	Superconductor, Robotics	SS Component	None
Pottery	None	None	Granaries, Hanging Gardens	None
Railroad	Steam Engine, Bridge Building	Industrialization	Darwin's Voyage, Railroads	None
Recycling	Mass Production, Democracy	None	Recycling Centers	None
Refining	Chemistry, The Corporation	Combustion, Plastics	Power Plant	None
Religion	Philosophy, Writing	None	Cathedral, J.S. Bach's Cathedral, Michelangelo's Chapel	Oracle
The Republic	Code of Laws, Literacy	Banking, Conscription	None	None
Robotics	Plastics, Computers	None	Artillery, Mfg. Plant, SS Module	Cannons
Rocketry	Advanced Flight, Electronics	Space Flight	Nuclear Unit (with Manhattan Project)	None
Space Flight	Computers, Rocketry	Plastics	Apollo Program, SS Structure	None
Steam Engine	Physics, Invention	Railroad	Ironclads	None
Steel	Metallurgy, Industrialization	Automobile	Battleships	None
Superconductor	Plastics, Mass Production	Fusion Power	SDI Defense	None
Theory of Gravity	Astronomy, University	Atomic Theory	Isaac Newton's College	None
Trade	Currency, Code of Laws	Medicine, Banking	Caravan	None
University	Mathematics, Philosophy	Chemistry, Metallurgy, Theory of Gravity	University	The Great Library
The Wheel	None	Engineering	Chariots	None
Writing	Alphabet	Religion, Literacy	Library, Diplomats	None