The Great Awakening

The Great Awakening was a spiritual renewal that swept the American Colonies, particularly New England, during the first half of the 18th Century. It began in England before catching fire across the Atlantic. Unlike the somber, largely Puritan spirituality of the early 1700s, the revivalism ushered in by the Awakening brought people back to "spiritual life" as they felt a greater intimacy with God.
The Awakening's biggest significance was the way it prepared America for its War of Independence. In the decades before the war, revivalism taught people that they could be bold when confronting religious authority, and that when churches weren't living up to the believers' expectations, the people could break off and form new ones.
Through the Awakening, the Colonists realized that religious power resided in their own hands, rather than in the hands of the Church of England, or any other religious authority. After a generation or two passed with this kind of mindset, the Colonists came to realize that political power did not reside in the hands of the English monarch, but in their own will for self-governance (consider thewording of the Declaration of Independence). By 1775, even though the Colonists did not all share the same theological beliefs, they did share a common vision of freedom from British control. Thus, the Great Awakening brought about a climate which made the American Revolution possible.