In What Ifs? of American History, edited by Robert Cowley, one essay ("The Cuban Missile Crisis: Second Holocaust", by Robert L. O'Connell) outlines a scenario where the Cuban Missile Crisis leads, via miscalculations, incompetence and trigger-happiness on both sides, to a two-day thermonuclear war, with horrific results in terms of both overkill and long-term effects on the world.
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