source: https://news.wsu.edu/2015/09/24/study-l ... egulation/Study links U.S. polarization to TV news deregulation
Increasing American political polarization is linked to television news deregulation following the federal Telecommunications Act of 1996, according to a Washington State University study.
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The Murrow researchers found that U.S. citizens have become increasingly polarized since 1996. And they found that greater use of TV news is associated with higher levels of polarization.
study: http://ijpor.oxfordjournals.org/content ... v012.short