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I'd say it's a tossup between the automobile and the internet. The revolver and railroads are somewhere up there too. ------------ Railroads are not the "invention", but the "steam engine" greatly affected the historic development of US industry and commerce. "Electric lighting" would rank highly as well. Internal combustion engines and computers are the modern equivalents. The telegraph, telephone, and the skyscraper all had their impacts. (There are millions of people around the world who have no day-to-day experience with any of these inventions.)

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