Now We Are Enemies (1963)— the battle of Bunker Hill from both sides of the firing line.
Beat The Last Drum (1963) — a panoramic account of the siege of Yorktown, the victory that won the Revolution.
One Small Candle (1964) — the story of the Pilgrims first year in the New World.
The Man From Monticello: An Intimate Biography of Thomas Jefferson. (1969)
West Point: The Men and Times of the U.S. Military Academy (1969)
The Man Who Dared The Lightning (1971) — a biography of Benjamin Franklin
The Forgotten Victory (1974) — the story of the 1780 battle of Springfield, N.J.- a clash that could have ended the Revolutionary War in Britain's favor.
1776: Year of Illusions (1975) — a revisionist view of America's most important year.
New Jersey: A History (1977)
The First Stroke (1978) — the battles of Lexington and Concord, written for the National Park Service.
The Living Land of Lincoln (1980) — a picture and text book celebrating Abraham Lincoln's "abiding presence."
Downright Fighting (1988)— the battle of Cowpens, written for the National Park Service.
Liberty! The American Revolution (1997) — the companion volume to the award-winning PBS television show of the same title.
Duel: Alexander Hamilton, Aaron Burr and the Future of America (1999)
Lights Along The Way, Great Stories of American Faith (1999) — a collection of articles, many originally published in Guideposts, the interfaith magazine.
The New Dealers' War: FDR and the War Within World War II (2001)
The Illusion of Victory, America in World War I (2003)
The Louisiana Purchase (2003) — part of a series, Turning Points in American History, published by Wiley.
Mysteries of My Father (2005) — a memoir
Washington’s Secret War, The Hidden History of Valley Forge (2005)
The Perils of Peace, America’s Struggle to Survive After Yorktown (2007)
The Intimate Lives of the Founding Fathers (2009)
Now We Are Enemies (2010) — Fiftieth Anniversary Edition
A Disease in the Public Mind (2013)
The Great Divide (2015)
Affectionately Yours: George Washington, A Self Portrait in Letters of Friendship (1967)
Benjamin Franklin: A Life in His Own Words (1972) is part of a series on the Founding Fathers published by Newsweek Books in the 1970s.
The Secrets of Inchon (2002) by Eugene Franklin Clark, edited with an introduction by Thomas Fleming — a first person narrative of the daring mission to make the 1950 invasion of Inchon in the Korean War a success.
Irish-American Chronicle (2010) – an illustrated history of the Irish in the United States.
First In Their Hearts (1968) — a biography of George Washington.
The Battle of Yorktown (1968) — an adaptation of Beat the Last Drum.
The Golden Door, The Story of American Immigration (1970)
Give Me Liberty, Black Valor in the American Revolutionary War (1971).
Thomas Jefferson (1971) is an adaptation of The Man From Monticello.
Benjamin Franklin (1973) — an adaptation of The Man Who Dared the Lightning. (REISSUED IN 2008 IN A NEW EDITION)
Band of Brothers, West Point in the Civil War (1988) — adapted from West Point, The Men and Times of the U.S. Military Academy.
Behind The Headlines, the Story of American Newspapers (1989).
Harry S Truman (1990) - a brief biography of the president.