The new alliance system is a great addition to the game, because it finally makes diplomacy worthwhile. The new bonuses are strong enough that I feel playing optimally will require having at least one alliance. As an example, it is hard to imagine why anyone would attempt to win a science victory without a research alliance (or whatever it is called.) Not only will this new feature actually reward players who pay attention to global politics, but it makes peaceful play more viable. It even provides an incentive not to conquer the weaker civs in the game. Think about it, the bonuses work both ways, so it would be preferable that you give a boost to a weaker civ instead of one that has the potential to win the game. Warmongering will still be very good of course, but it will come with the adding challenge of conquering without alienating your allies. How do you guys think the new alliance system will change the game?