From the lightbulb to the airplane, to medical breakthroughs and the internet age, the past 250 years have been defined by America's intrepid intellect.
The American innovations that catapulted the U.S. into a world superpower touch almost every facet of modern life.
From the lightbulb to the airplane, to medical breakthroughs and the internet age, the past 250 years have been defined by America's in... [14030 chars]