In the 1920s, every major country established which of these?

Question

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During the 1920s, radio broadcasting became a popular form of entertainment and communication. As a result, many major countries established national radio broadcasting networks to regulate and monitor this new medium. Television broadcasting did not become widely available until the 1950s, so B is not a correct choice. Free public health insurance systems were not established in every major country during the 1920s, so C is not a correct choice. Mandatory military service programs were already established in many countries before the 1920s, so D is not a correct choice.

In the 1920s, Every Major Country Established Which of These