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Technology in the now free game Imperialism takes the shape of various discoveries of the Industrial Revolution that become available at irregular intervals from fairly early in the game. Not all appear in the same game year as they appeared in history.

As soon as one becomes available, it will be listed - click the "Invest in Technology" button. If you have all necessary prerequisites, its price will appear in the "Cost" column; if not, that table cell will list any remaining prerequisites.

List in approximate order of availabilityEdit

The quoted years are for the standard game; they will differ for some scenarios.
YearName$PrerequisitesEffect
1815High Pressure Steam Engine 0?-Engineers can build railroads between tiles that contain desert, farm, forest, plain, or tundra (at $100 per tile except $150 for tundra and either sort of forest); (swamps need to wait for the Iron Railroad Bridge and hills wait till the late 1830s, mountains a further 5 decades)
1815Seed Drill0?-Farmer improves grain farm and orchard to level 1 at a cost of $100 per tile
1816
-20
Cotton Gin1,000-Farmer improves cotton plantation to level 1 at a cost of $100 per tile; prerequisite of Spinning Jenny
1821
-24
Iron Railroad Bridge1,500-Swamp is now available for railroads though at a cost of $300; more importantly, the bridge enables Forester unit, who can improve hardwood forest to level 1 - then he must wait for Compound Steam Engine in the late 1830s to go to level II
1821
-24
Feed Grasses1,500-Enables Rancher unit, who can improve wool farms and livestock ranches to level 1; prerequisite of Spinning Jenny
1821
-25
Square-Set Timbering1,500-Miner upgrades mines to level 2 (4 units) at a cost of $1,000 per tile
1821
-25
Streamlined Hulls1,500 Clipper Ship - cheaper and faster than Indiaman or Paddlewheeler but with no armor
1826
-29
Spinning Jenny3,000Cotton Gin and Feed GrassesFarmer upgrades cotton plantation to level 2. Rancher upgrades wool farm to level 2 at a cost of $1,000 per tile. Required for Power Loom.
1826
-30
Paddlewheels3,000-Enables Paddlewheeler and Raider, (which still need lumber but use steel or arms, respectively, along with coal, instead of fabric)
1831
-35
Steel Plows3,000 Farmer improves grain farm and orchard to level 2
1836
-39
Bessemer Converter6,000 Build level 2 Forts; recruit Sharpshooters and Scouts, and convert Light infantry and Hussars to those units; also (not documented in the game itself) recruit demolitionists and upgrade sappers to them
1836
-38
Compound Steam Engine7,000Iron Railroad BridgeEngineer puts railroad through hills (at $200 per tile) and can build depots there (though AI nations can do that from the start); Forester upgrades hardwood forest to level 2 at $1,000 per tile
1841
-45
Breech-Loading Rifles12,000Bessemer Converter Recruit Rifle Infantry, Guards, and Carbine Cavalry and upgrade Regulars, Grenadiers, and Cuirassiers to those
1841
-44
Rifled Artillery10,000 Recruit Field Artillery and Siege Artillery; upgrade light artillery and artillery to those units
1846
-50
Advanced Iron Working12,000 Ironclads
1846
-51
Power Loom12,000Spinning JennyFarmer improves Cotton and Rancher improves Wool to level 3
1851
-55
Mechanical Reaper12,000 Farmer improves grain farm to Level 3
1856
-60
Commercial Fertilizer12,000 Farmer improves Orchard to level 3
1856
-58
Oil Drilling25,000 Create Driller, produce Oil at level 1, prospect for oil in desert and swamp, build refinery and power plant (north-east of the steel mill)
1862Barbed wire Rancher improves livestock ranch to level 2
1866-68Steel armor plate Advanced ironclad( After you buy it ships-of-line retired because of alleged obsolescence.)
1886Large artillery40,000 Level III fort; Railroad Gun; Mobile Artillery
1887Dynamite Railroad into mountain; timber and mines to level 3
1889Marine engineering
1893Machine Guns100,000
1894Chemistry120,000
1897Improved range-finding150,000 (After you buy it, you may find some of your ships retired because of alleged obsolescence.)
1898Internal combustion Chemistry

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