Inskeep is the author of four books: Instant City: Life and Death in Karachi (2011), Jacksonland: President Andrew Jackson, Cherokee Chief John Ross, and a Great American Land Grab (2015), Imperfect Union: How Jessie and John Fremont Mapped the West, Invented Celebrity, and Helped Cause the Civil War (2020), and Differ We Must: How Lincoln Succeeded in a Divided America (2023).