Nikola Tesla: US Citizen
Redesigned direct current generators, Tesla coil, AC Power, and more things than I can imagine while working in the US as a US citizen...
Albert Einstein: US Citizen
E = mc2, Inspired Manhattan Project, Refined his theories for Quantum Mechanics, exc.
Benjamin Franklin: US Citizen
born on Milk Street, in Boston, Massachusetts. lightning rod, Franklin stove, bifocal glasses, exc,. once again invented more things than I can Imagine...
Werner von Braun: US Citizen
We got him before the Soviets did, development of the Saturn V booster, Jupiter-C which launched Explorer 1, the concept of a manned space station...
All US Citizens...