The "Third Great Awakening" was a period of religious activism in American history from the late 1850s to the 1900s. It affected pietistic Protestant denominations and had a strong sense of social activism. It gathered strength from the postmillennial theology that the Second Coming of Christ would come after mankind had reformed the entire earth. The Social Gospel Movement gained its force from the Awakening, as did the worldwide missionary movement. New groupings emerged, such as the Holiness movement and Nazarene movements, and Christian Science. Significant names include Dwight L. Moody, Ira D. Sankey, William Booth and Catherine Booth (founders of the Salvation Army), Charles Spurgeon and James Caughey. Hudson Taylor began the China Inland Mission and Thomas John Barnardo founded his famous orphanages. The Keswick Convention movement began out of the British Holiness movement, encouraging a lifestyle of holiness, unity and prayer.