Earlier quoted context omitted.
Actually this is debatable. The USA has the first military power in the whole world and could go and invade a bunch of countries if they wanted to and nobody would oppose them. Since they are not doing so, its hard to call them belligerent. The British Empire was way worse than the USA all things considered.
Well they've done it, remember when they took half Mexico?
Mexico came a long time ago, we aren't doing stuff like that anymore. Except when we invade small countries like panama, that we still do.