In the 1930s, the medium, most people used to get information about world events is radio.
There are various mediums from which we can get information now, such as TV, mobile phone, radio, etc.
But in before times, very few mediums are there for information and radio was the important and only one.
Thus, radio was the medium used by in the 1930s to get information.
Learn more about mediums of information
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