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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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.

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.

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