They could have an exhibit like that, perhaps describing how they were trying to make amends, donating money to projects promoting pluralism and diversity, opposing authoritarianism around the world, helping the descendants of those they harmed, etc.

But they're not going to, because the people in charge don't sincerely care about the topic.

As for Iraq: I don't see much evidence that US actions there were "best-intentioned", or even well-intentioned.