Age of Empires 3, like its predecessors, is a real-time strategy (RTS) computer game developed by Microsoft. This game is set in the time period of discovery and colonisation of the New World and is therefore vastly different from either Age of Empires 1 or 2. Another major difference from the previous offerings of the game is the way you build forts. Instead of using builders to build a fort, Age of Empires 3 uses a fort wagon that is not made available until the Industrial Age of the game.
Gather 800 food using settlers and advance from the Discovery Age to the Colonial Age.
Gather 1,200 food and 1,000 gold using settlers and miners and advance from the Discovery Age to the Fortress Age.
Gather 2,000 food and 1,200 gold using settlers and miners and advance from the Fortress Age to the Industrial Age. When prompted, select a governor. Look at all the different special features each governor has to offer and select the governor that gives you a "Fort Wagon."
Click the fort wagon and select the option to build a fort. The fort wagon will transform into a fort.