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Guglielmo Marconi, 20yo invented the first radio in 1895.
He went to England for his project.
Fastly, a lot of people started using this invention.

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1) The 1920s : Prosperity and a New Medium

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1) The 1920s : Prosperity and a New Medium

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November 2 1920 :  first professional radio broadcast
It was a fast progression: a million homes had a radio in 1922 !
Of course, the radio was a new gadget-that was part of its fun. But its strongest excitement wa that for the first time, people could hear voices from cities scattered around the country, Newark, Detroit, Chicago ...

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Who listened?
In the 1930s and 1940s, the radio is booming, and all the population  listened
What did they listen to?
According to the type of people they were and the time of the day, they listened to different things such  as Children's Program, Women's show, Breakfast shows, drama and suspense shows, comedy...

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During a hallowen night in 1938, there was a show on the radio : "The Theatre Mercury Air Production". Orson Welles directed a play about an invasion of Mars' aliens.
Nevertheless, thousands of people didn't hear the opening credit (générique) and they thought that it was really happening. They believed that a cloud was poison gas. So, there was a wave of hysteria in many cities.
Here the original record of the radio.
(Orson Welles)

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4)News on the radio from the 1930's to the 50's 

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4)News on the radio from the 1930's to the 50's 

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news coverage:  Charles A. Lindbergh's arrival in Washington after his solo transatlantic flight.
the explosion ofthe airship Hindenburg.
President Roosevelt's Day of Infamy speech after Pearl Harbor
memorable broadcasts were covering plenty of news.
journalists investigations:
news interviews, panel discussions, and documentaries.
impact:  Radio brought the voices of politicians, too, directly into millions of American homes. No politician was better at using radio than Franklin Roosevelt

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ww2 was called the "radio war" because the radio was giving news, and lots of information about the war. It helped people to be aware of what was happening , know what to do and how to act (radio was giving guideline  on how to help, like:  buy war bonds,  plant victory gardens, donate blood, eliminate waste etc...)
conclusion :
After ww2, the radio became even more succesful, almost every American listened to it everyday. But they listened differently than they used to. They now listen to it to get the latest headlines or to be set in a good mood on their way to work.

They listen while doing other things, like driving or cooking, usually when they're alone. In a few years, technology will make it possible for the radio to become evenn more oriented to individuals.