The Industrial Age is the sixth age a player can reach in Rise of Nations. It can be reached after any four additional technologies are researched through the Library (eighteen in total), and paying 1050 Food and 2100 Knowledge.
After advancing to the Industrial Age, players are given a new palette of buildings to build, technologies to research, and units to create. As semi-automatic and automatic weapons come into play, troop tactics begin to change. Early tanks and armored vehicles and primitive airplanes can now be built, as a new basic resource, Oil, is introduced. Also, the rare resources Aluminum, Coal, Rubber, Titanium and Uranium are revealed. New buildings in this age include the Airbase, the Oil Platform, the Oil Well and the Refinery as well as the Statue of Liberty and Taj Mahal wonders. The last government choices in the game are also unlocked in the Industrial Age, Capitalism and Socialism.