I think their 'police' status is falling. With their economic-recession and war on terror almost at an end, I doubt they'll be known as the world police for very much longer.
They've been the dominate superpower since Russia failed - now China is becoming the new-superpower. Let's see if America has their way around the world when China becomes the new Russia to content with. Let's not hope they have a radical idea on Communism spreading as well, I doubt China are like the Russians.