The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
We do not know the inventions you have read about. You did not include any text or reference about that.
What we can do for you is to share the following information.
I think the American invention that has been the most important to the United States is the invention of the internet by John Blankenbaker in 1971 and developed by the US Army. This is the most important invention because it has allowed extraordinary advances in communications and up today, every single office and home has one computer or PC with Internet. Through the internet, we can study, work, connect with other people, and do so many important activities in government, trade, e-commerce, and more.