What country has yielded the most advancement for human kind throughout history?

The USA. We've provided or invented the airplane, nuclear weapons and nuclear power, the artificial heart, the lightbulb, phonograph, and telephone, the embly line, repeating firearms, the microchip, we've put men on the moon (and invented both Tang drink mix and the microwave oven in the process), we've made more contributions to medical advances and cancer research than any other country, we created both rock and roll music, the blues, bluegr, and country and western music, we inventred the phrase and the meaning of "superior firepower", we won WWII for the rest of the world (yes, it's true), we've contributed hundreds of first-cl writers, artists, architects, etc... to the field of culture and arts, (need I go on?)