This is the story of the United States, the atom and Iran.
It's the story of a historic nuclear agreement — a story we may be tempted to think we know. After all, Congress just finished a chaotic debate that ended when lawmakers failed to block the deal. There was no solemn national moment of decision — no up-or-down vote, as with a treaty or a war.
But this was just the latest twist in a long and complex tale that dates back more than a half-century.