Code Geass

Seven years ago, the Holy Britannian Empire invaded Japan to secure the nation's stocks of a rare mineral that made a new energy source possible. During the war, Britannia introduced their Humongous Mecha, the Knightmare Frames, into combat that became instrumental in defeating the Japanese. Following its victory, Britannia renamed Japan to Area 11, stripping the nation of its autonomy, its national identity, and even its name.

Example of:
War Was Beginning