The Empire is what remains of the Earth's nations after the First Lunar War.
Following the untold destruction as a result of the Great War, the nations of earth united under a single banner: The Empire.
The Empire is a military run dictatorship, focusing on developing military over culture. However, they have managed to rebuild their capital over the old city of Sodom.
German seems to be the primary language of the Empire. Little explanation is given for this. However, it is alluded to that the reason for this is that the capital city is built over the old Autobahn.
The Empire's military consists of a number of fighters, land based vehicles, and armored trains. Detailed below is a list of their war machines at the time of the games events: