What is the most important scientific discovery to come out of the United States?

It's difficult to pinpoint one scientific discovery as the most important to come out of the United States, as there have been so many groundbreaking discoveries made by American scientists. However, one discovery that has had an enormous impact on the world is the discovery of the structure of DNA, which was made by James Watson and Francis Crick in 1953.

Watson and Crick's discovery of the double helix structure of DNA revolutionized our understanding of genetics and laid the foundation for the field of molecular biology. This discovery has had a profound impact on fields ranging from medicine to agriculture, and has led to countless breakthroughs in our understanding of the human body, disease, and the natural world.

Other important scientific discoveries that have come out of the United States include the development of the internet, the invention of the transistor, and the discovery of the Higgs boson particle. These discoveries, along with countless others, have had a major impact on the world and continue to shape our understanding of the universe.