Growth in the Northeast was accompanied by the creation of moral reform organizations, such as Sunday schools, temperance associations, tract and Bible societies, and orphanages. The proliferation of voluntary organizations was encouraged by postmillennialism, the belief that the Second Coming of Christ would occur at the end of an era of peace and prosperity fostered by human effort. The 1815 General Assembly recommended the creation of societies to promote morality. Organizations such as the American Bible Society, the American Sunday School Union, and the American Colonization Society, while theoretically interdenominational, were dominated by Presbyterians and considered unofficial agencies of the Presbyterian Church.