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The growth of the first commercial printing industry around London's Grub Street is cited as a beginning for mass media.
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The invention of the telegraph.
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Mass-produced print products were commonly available in Europe and North America.
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Completion of the Atlantic cable, enabling global news transmission.
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Invention of the phonograph.
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Silent movies became increasingly popular.
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Sales of recordings reached mass proportions, and commercial radio popularized music genres.
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The first U.S. commercial radio station went on the air.
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Newspapers, magazines, movies, phonograph records, and radio programs were widely available in America.
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Broadcast television emerged as a major mass medium.