Three historical and futuristic story-driven campaigns:
is the official expansion pack for the real-time strategy (RTS) classic Empire Earth . It introduces significant new content, including a final 15th epoch, new civilizations, and unique special powers. Key New Features
Metallurgy allows paying for units using gold and iron interchangeably.
Every civilization now has a unique "Civ Power" or special building/unit. For example: United States: Build a Market to trade resources.