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How did the development of the radio impact the realignment of global powers during the 1920s?
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How did the development of the radio impact the realignment of global powers during the 1920s?

User FrenchMasterSword
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May 30, 2007 — Three revolutions have come via the airwaves. ... November 2, 1920: KDKA, the first commercial radio station in the United States, goes on ... April 3, 1973: Martin Cooper of Motorola makes the world's first cell phone call. ... Thanks to the amplifying power of the newly invented vacuum tubes, hams started ...

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User Michael W Moriarty
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