America has a well-documented history of facts including people, events, dates and documents.
For a long time the concepts of America's history and its character were taught in schools and so passed from generation to generation.
But, just as God sowed Wheat and the Enemy came along and sowed Tares, the Enemy came along refuting the truth of America's founding and replacing it with Lies to effect a transformation of America's character.
If you have ever been close to a person with alzheimers you know the tragedy of watching the person go from a well-defined individual to one who doesn't even know who they are, much less the people in their lives.
As sad as that is on an individual basis, it is so much more tragic for it to happen on a national basis. The America that was is no more because it has lost its collective mind.