[bleedingboy]

those nations knew their consequence of action, america knew the consequences of their action. all of these wars are consequences of effects of some cause. world war 2 rooted out from world war 1. and so on and so forth.
here's what you should keep in mind, that to keep the minds of their [nation's] people, they'll tell the story from a their perspective that they've won.

an example
i once saw a documentary on how things were justifiable when they colonized our country or bought it off from another, and how they establish a sentence that seems to claim, "if it wasn't for us..." that's their perspective, the justify their works. but then from our side...."they were wrong, the enemy and the invaders."