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"The first modern mass medium, radio made America into a land of listeners, entertaining and educating, angering and delighting, and joining every age and class into a common culture. . . Radio created national crazes across America, taught Americans new ways to talk and think, and sold them products they never knew they needed. Radio brought them the world."-Source: Tom Lewis, historian, "'A Godlike Presence': The Impact of Radio on the 1920s and 1930s," 1992According to the passage, which of the following best explains the most important effect that the radio had on American society?

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