World War I accelerated the event of radio for army communications. After the warfare, industrial radio AM broadcasting started in the Nineteen Twenties and have become an essential mass medium for leisure and news. World War II once more accelerated the event of radio for the wartime functions of plane and land communication, radio navigation and radar. Development of stereo FM broadcasting of radio occurred from the Thirties on-wards within the United States and displaced AM because the dominant industrial normal by the 1960s, and by the Seventies in the United Kingdom.
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