The document discusses the history of media bias in the United States from the McCarthy era to present day. It describes how coverage of events like the Vietnam War and civil rights movement were seen as liberal biased and led conservatives to establish their own media. Today, mainstream media outlets are accused of bias by President Trump and amplified by conservative media like Breitbart and Hannity, while these same outlets promote falsehoods. Coverage is also characterized by "asymmetrical polarization" with conservative media attacking mainstream outlets.