The United States is the largest and oldest democratic nation on earth. Our guiding principles are based on the understanding of the rights for all humanity. That being said we have a responsibility to step in and lend aid when humanitarian rights are at stake. Hopefully, we have politicians guiding this process so that we don’t lose sight of our humanitarian obligation in place of personal political agendas, but just as the United States has and continues to be a refuge, “Give me your tired, your poor, your huddled masses yearning to breathe free…” we have and should continue to be a guardian.
I would like to see us take more of a humanitarian approach to other countries such as we are in Haiti after the massive earthquake, however if you look at our past record we have started and fought wars under the umbrella of "humanitarian efforts".I do however feel that as one of the most powerful nations in the world we do have certain peace keeping responsibilities.
You will find a series of answers to this particular question. I think that the idea of the United States enforcing law and order throughout the world might be one such answer. At the same time, I would propose that much has been done in the name of the United States as being the world policeman that has not been very good, overall. While the United States' intervention in both World Wars was specific and did help to address issues on the global stage, other instances such as Korea, Lebanon, and Vietnam, and, to a certain extent, the challenges in Afghanistan and Iraq, has resulted from the perception of the United States as an exceptional power that has the authority and unilateral prowess to become assume a worldwide stage of imperialism. I think that there might be much to suggest that the United States can give support to nations in need and can help those who are in challenging predicaments without being seen as an imperial power that imposes its will on other nations without any check, restraint, or consent.
I think the world needs a powerful country like the United States to police the world. If the United States wasn't throwing its weight around in other countries' affairs then a less just country would be doing it in their place. The foundation of the United states constitution is freedom and a less flexible country would enforce their own strict regime and beliefs on weaker nations or nations in conflict.