Some of it comes down to the "realism" angle. Look at the major wars of the Western world (the main consumers of these types of games). Who has usually been the major player, for better or worse, in these wars? The US. Realistically speaking, if you were to walk out on a battlefield of that war, most of the troops you'd see would be American.Giuglea said:snip
And that reality colors our fictional war scenarios, too. After all, good fiction still has roots in believability. Which is more believable? That someone is trying to take over America, or trying to take over Australia? That America is trying to destroy Russia, or that the Philippines are trying to destroy China?
It's just the flavor of the political landscape at the moment.