There are a wide variety of Civilizations and leaders to choose from in the game. Each has its own special units, buildings and/or abilities - America has the Minuteman and the B-17 Bomber, Rome has the Legion and the Ballista, and Russia has the Cossack and the Krepost. Learning to manage each Civilization's strengths and weaknesses is one of the most fun aspects of play and makes every game different. If you play Egypt using the exact same strategy as you use when playing India, you may be missing the point.