Post World War II, and then especially post the fall of the Soviet, I think it not entirely unreasonable to suggest that our nation has become the biggest bully on the block.
Some of the military actions we have taken are mortally justifiable on humanitarian terms, many are not.
Viet Nam, for example, clearly not a good war.
Korea, OTOH, easier to justify.
The invasion and occupation of Iraq, not in my opinion, a morally defensible action.
The invasion and toppling of the Taliban in Afghanistan was, I think, more than justified.
Nobody here is, I suspect, thinking that this question is really a call for an end to war.
But a representative democractic republic ought not to be engaging in wars of empire, neither should we have troops permanently stationed in as many nations as we currently do.
Much of our foreign policy is no longer about defending this nation, but instead seems to be about defending the modern American version of colonial (via internatiopnal corporate cuts out) mercantilism.