In the epic tradition of Stephen Ambrose’s Undaunted Courage, This Vast Enterprise offers a bold new take on the Lewis and Clark expedition, humanizing forgotten figures and shattering long-held myths about one of the most beloved episodes in American history.

Celebrated young historian Craig Fehrman, whose first book, Author in Chief, was hailed by Thomas Mallon in The Wall Street Journal as “one of the best books on the American presidency to appear in recent years,” delivers a major new account of the Lewis and Clark expedition.

When Meriwether Lewis and William Clark returned from their long journey, in 1806, they brought an incredible tale starring themselves as courageous explorers, skilled scientists, and peaceful ambassadors. There was truth in those descriptions. But there was also distortion.

For the first time in a generation, This Vast Enterprise offers a fresh and more accurate account of their expedition—a gripping narrative that draws on new documents, stunning analysis, and Native perspectives. Fehrman’s central insight is that the success of Lewis and Clark depended on much more than just Lewis and Clark. We all know Sacajawea, and some of us know York, the Black man Clark enslaved. But This Vast Enterprise introduces us to John Ordway, a working-class soldier who fought grizzlies and towed the captains’ bulky barge. It introduces us to Wolf Calf, a Blackfoot teenager who watched his friend die in a battle with Lewis and his men.

To capture this cast of characters, each chapter in This Vast Enterprise moves to a new point of view, describing that person’s desires and contradictions with an unprecedented level of care. Fehrman balances the story’s inherent adventure with the humanity of its protagonists. One chapter shows Thomas Jefferson operating in an age of bitter partisan unrest—his secret maneuvers to fund the expedition, uncovered here for the first time, are a case study in presidential power. Another chapter reveals the strategy and strength of Black Buffalo, a Lakota leader, completely upending our understanding of early Lakota American diplomacy. In his chapters, Clark is not a bad speller but a student of the Enlightenment. (Fehrman found Clark’s college notebook.) Lewis is someone whose psychological demons feel at once heartbreaking and modern.

And yet, in the end, the captains are men who needed help—from Sacajawea, from York, and from each other. Their expedition truly was a vast enterprise, a sprawling and federally funded military mission that came down to the heroic sacrifices of a few human beings. This book portrays those people, all of them, for the first time. It is more than just a work of history—it’s a testament to the power of innovative research and emotional storytelling, and a thrilling reminder that even the most familiar moments in history can still surprise us.