Historians of the future, looking back on the twilight years of the twentieth century, may designate the mid-1970’s as worthy of that supreme accolade accorded only the most significant dates in history: to serve as a dividing point between chapters in their textbooks. If they do, their judgment will be based not on the Watergate scandals (they would know that Grant and Harding had occupied the White House in the past and that human frailty could occasionally tarnish even a President), or even on the bitter conflict over the “Imperial Presidency” (they would be aware that Congress and the President traditionally had vied for power and that authority had fluctuated between the two in unpredictable cycles).