This document discusses the history of media bias in the United States. It outlines how the media landscape has become increasingly polarized over time, with traditional mainstream media portrayed as liberal and new conservative media like Fox News and Breitbart attacking the mainstream. This polarization has contributed to a situation where facts reported by nonpartisan groups are dismissed as "fake news" if they do not align with certain political viewpoints. The document questions how journalism can fulfill its obligation to truth and hold politicians accountable in this asymmetric environment of polarization.