Original sentence: The United States saw dramatic growth in the popularity of talk radio during the 1990s.The repeal of the FCC "fairness doctrine" in 1987—which had required that stations provide free air time for responses to any controversial opinions that were broadcast—provided an opportunity for a kind of partisan programming that had not previously existed
Edited sentence: The United States saw dramatic growth in the popularity of talk radio during the 1940s.The repeal of the FCC "fairness doctrine" in 1987—which had required that stations provide free air time for responses to any controversial opinions that were broadcast—provided an opportunity for a kind of flatly partisan programming that had not previously existed