Final answer:
The 'Lost Cause' is a myth that romanticizes the Confederacy and downplays the role of slavery in the Civil War. It distorts historical facts and promotes an inaccurate narrative.
Step-by-step explanation:
The 'Lost Cause' refers to the romanticized view of the Confederacy and the South's defeat in the American Civil War. It portrays the Confederacy as noble and heroic, defending states' rights and a way of life, while downplaying the role of slavery as a cause of the war. Considered a myth, the 'Lost Cause' distorts historical facts and promotes a distorted narrative of the Civil War.