Empire Earth is a real-time strategy video
game Sierra and released in 2001.
The players must collect resources to make
buildings, make citizens, and destroy opposing civilizations.
Empire Earth spans 500,000 years of world
history, has 14 epochs, from prehistoric age to the nano age.
An expansion pack called Empire Earth: The
Art of Conquest was released in 2002.
It added new features such as a special
power for each civilization, and a new 15th epoch the Space Age.