Best thing that the US has brought to the world?

Probably blues and jazz. Although the United States is credited with the invention of rock and roll music, I'd have to say it's roots probably run much deeper than U.S. culture. Come to think of it, The United States hasn't brought very much to the world other than the first successful aircraft. Most of the inventions we use today came from a culmination of trials and experiments performed by different people from different times in different cultures.