I would pick the U.S. hands down, but with one condition:eliminate and guard against the corruption rampant in the U.S. government. How? A world-wide organization of elite spec-ops and all-encompassing spy network dedicated to truth, justice, and equality for all. There would have to be a strenuos screening process to ensure that only those with the requsite morals and open-mindedness were recruited. They would also have certain extra-legal rights to ensure corruption couldn't hide behind the law, but once their investigation was complete, every detail of it would be released to the public, save the identities of the organizations spies.