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In 1920, KDKA in [[Pittsburgh]], [[Pennsylvania]], became the first commercial radio station, and radio quickly developed into the center of entertainment for families. Use of radio spread most quickly in the [[United States]].
In 1920, KDKA in [[Pittsburgh]], [[Pennsylvania]], became the first commercial radio station, and radio quickly developed into the center of entertainment for families. Use of radio spread most quickly in the [[United States]].
[[category:history]]
[[category:United States History]]