I: The network radio era, 1921-1950 -- Industrial innovation and diffusion: the radio networks -- Radio's social, cultural, and political impact: the first mass medium -- The development of a new aesthetic: sounds -- II: Transition, 1945-1957 -- TV replaces radio in the living room -- Radio reinvents itself: top 40 and beyond -- III: Network television dominates, 1958-1982 -- CBS, NBC, and ABC covering the USA -- Network TV's social, cultural, and political impact -- The genre machine: from Maverick to M*A*S*H* -- IV: Contemporary history, 1982-1996 -- Radio: The FM era -- Television: remote control paradise -- Epilogue: Still a broadcasting nation: 1996 and into the future.
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