Did Eisenhower avoid a showdown with Stalin by not taking Berlin before the Soviets? What might have happened if JFK hadn't been assassinated? This new volume in the widely praised series presents fascinating "what if..." scenarios by such prominent historians as: Robert Dallek, Caleb Carr, Antony Beevor, John Lukacs, Jay Winick, Thomas Fleming, Tom Wicker, Theodore Rabb, Victor David Hansen, Cecelia Holland, Andrew Roberts, Ted Morgan, George Feifer, Robert L. O'Connell, Lawrence Malkin, and John F. Stacks.

Included are two essential bonus essays reprinted from the original New York Times bestseller What If?-David McCullough imagines Washington's disastrous defeat at the Battle of Long Island, and James McPherson envisions Lee's successful invasion of the North in 1862.