Out of the inventions you have read about which one do you think has been the most important to the United States

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We do not know the inventions you have read about. You did not include any text or reference about that.

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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.

randy pausch was a famous mathematician, writer and lecturer who is particularly famous for his last speech, given in 2007, "the las lecture", because he illustrates why one's dreams need to be pursued in a logical order if success is to be obtained, option c. at this time, pausch had been diagnosed with terminal cancer so he told the audience to follow their childhood dreams, which were possible to achieve. it has been recognized as one of the best motivational speech around the world.