Apocalypticism has had a powerful impact on American life. It has fostered among adherents a strong sense of purpose and personal identity, it has helped them interpret the challenges they face all around them, and it has provided them with a triumphant vision of the future. Although there are many kinds of apocalypticism, in the United States, Christian forms have dominated. The Bible’s focus on a coming millennium has offered Americans the promise of transformation and redemption in a world that sometimes seems void of both. When Christians have emphasized the Bible’s apocalyptic and millennial visions, they have acted in new and important ways. Apocalyptic visions, rather than fostering a sense of indifference to the coming of the end of days, have served as a call to battle. God, millennialists insist, has given them much to do and very little time in which to do it. Positive that Jesus is coming soon, they have preached revival and engaged directly and aggressively with their culture. Sometimes their actions have served to reinforce the status quo, and at other times they have sparked revolutions. The uses of apocalypticism and millennialism are almost as diverse as their adherents.