Scientific innovations created jobs for Americans by that product going nation-wide. What that means, is that when someone's scientific innovation went nation wide, or even global, they wold have to build factories, and places to make and sell that product. With those new buildings, comes new jobs, and he economy is improved. Take Thomas Edison for example. He commercialized the light bulb. When it became popular, he build huge power plants to build his product. He had to have people build his product inside the power plant. Those new jobs were filled by Americans.
