Why AMERICA considers itself the 'MOST POWERFUL' ?????

Yes, the US is the most powerful country in the world, whether you measure it politically, economically, militarily, or culturally. China or India could become more powerful, yes. It would take a while. It's unlikely that America will stay at the top forever. yeah for sure its on the top right now.... but we really dont know what the future holds...... Every great nation/civilization ... went throught a decline and eventually broke down into pieces .... take a look at history... none of the great civilizations in teh past .. stayed on top.... Romans/british/russians/greeks... turkish... they all faught brakely .. they all got their glory but the end was harsh.... USA has been a great power since world war 2 upto the present... but this created enemies for this country... I just hope we dont go through world war 3... :) nobody really knows what the future holds ..... yeah usa is great and powerful.. but i believe that bush is pushing our country upto its limits