The World's Foremost Historians Imagine What Might Have Been, is an anthology of twenty essays and fourteen sidebars dealing with counterfactual history.

Putnam's Sons in 1999, ISBN 0-399-14576-1, and this book as well as its two sequels, What If?

of American History, were edited by Robert Cowley.

Cowley decided to create the book after several "What if?"

articles were published in the Military History Quarterly, which he edits, and received much attention.