What Ifs? of American History, subtitled Eminent Historians Imagine What Might Have Been, is a collection of seventeen essays dealing with counterfactual history regarding the United States. It was published by G.P. Putnam's Sons in 2003, ISBN 0-399-15091-9, and this book as well as its two predecessors, What If? and What If? 2, were edited by Robert Cowley.

What If?, subtitled The World's Foremost Military Historians Imagine What Might Have Been, also known as What If? The World's Foremost Historians Imagine What Might Have Been, is an anthology of twenty essays and fourteen sidebars dealing with counterfactual history. It was published by G.P. Putnam's Sons in 1999, ISBN 0-399-14576-1, and this book as well as its two sequels, What If? 2 and What Ifs? of American History, were edited by Robert Cowley. It was later combined with What If? 2 to form The Collected What If?.