Are America's Wars Just and Moral?

From the article--"Among the principles for a just war, it must be waged as a last resort, to address a wrong suffered, and by a legitimate authority. Deaths of civilians are justified only if they are unavoidable victims of a deliberate attack on a military target."

I don't believe all of our ward/conflicts were just and moral. And I can't say I agree with the premise of the quoted paragraph. There are other conditions which may justify a nation entering--not beginning--a war: one is an attempt to dominate and to deprive another country of their freedom, and defense of a weak nation that is being unjustly crushed by a strong ruthless one