For most Americans, the history of the United States is built on a set of long-accepted beliefs about events, each of which resonates in the nation's collective memory. But what if those beliefs, however familiar, don't really tell the whole story? Our knowledge of history - or what we believe to be history - is the lens through which we view and interpret the world. And when that lens is distorted with misleading information, it has powerful effects on how we perceive the present and how we make decisions in the future, from choosing whom to vote for to interpreting the latest developments in today's news and opinion pieces.