In the midst of today’s political turmoil it’s natural to cast about for reasons. How did we get here? In a post-truth environment have we seen the last of civil discourse, reasoned debate, and bipartisan compromise? Are American values outdated? Partisan politics has created dueling parties where tribal nationalism is at war with liberal globalism. Can our constitutional infrastructure withstand the pressure of a president’s autocratic impulses? Is America too big and too diverse to be governed democratically? Do we have an underlying unifying principle?