More than forty years ago, conservative Christianity emerged as a major force in American political life. Since then the movement has been analyzed and over-analyzed, declared triumphant and, more than once, given up for dead. But because outside observers have maintained a near-relentless focus on domestic politics, the most transformative development over the last several decades-the explosive growth of Christianity in the global south-has gone unrecognized by the wider public, even as it has transformed evangelical life, both in the US and abroad.