Sword of the Spirit, Shield of Faith
From Lauren's list on the history of religion in U.S. foreign relations.
This is a magisterial work and the perfect starting point for anyone interested in learning about how religious beliefs and religions of all types have played a role in U.S. foreign policy since the colonial era. It is an incredibly comprehensive and deeply researched book, but do not let its heft deter you—Preston is a skilled narrator and you will find yourself immediately immersed in and absorbed by the stories he shares. His ability to illuminate the links between religion and the core ideas that have guided the U.S. engagement with the world over the past four hundred years is a truly impressive achievement.