Political theorist William B. Allen, editor and translator of a new edition of Montesquieu’s The Spirit of the Laws, and Alison LaCroix, author of The Interbellum Constitution: Union, Commerce, and Slavery in the Age of Federalisms, explored the intellectual foundations—from Montesquieu and beyond—of the U.S. constitutional vision and core values from America’s founding through the Civil War. The discussion was moderated by Jeffrey Rosen, president and CEO of the National Constitution Center.