Who is the most successful president in American history? George Washington secured American independence. Abraham Lincoln preserved the union and ended slavery. Franklin D. Roosevelt ended the Depression, remade government, and won World War II. But if we define "success" as the ability to articulate your goals and achieve every single one of them, perhaps only one president in American history was ever perfectly successful.

In 1845, James K. Polk, newly elected by a whisker-thin margin, confided to his friend George Bancroft the four goals of his four years in the White House.

Four years later, he'd done all this and more. As the historian Daniel Patrick Howe wrote, "Judged by these objectives, Polk is probably the most successful president the United States has ever had.” And that’s why Polk is the subject of today’s show. I don’t think another president in American history has so large a gap between his modern reputation and his actual achievement.

There are two great biographies about Polk that I’ve read that have been published in the last 20 years. I’m very pleased that today, we have both authors on the show. Walter Borneman is the author of 'Polk: The Man Who Transformed the Presidency and America.' And Robert Merry is the author of 'A Country of Vast Designs: James K. Polk, the Mexican War and the Conquest of the American Continent_._'

If you have questions, observations, or ideas for future episodes, email us at [email protected].

Host: Derek Thompson

Guests: Walter Borneman and Robert Merry

Producer: Devon Baroldi

Learn more about your ad choices. Visit podcastchoices.com/adchoices