Without knowing the Holy Spirit's work in history, we cannot possibly understand what He is doing today, much less prepare for what He will do. In this third and final installment, the reader will learn how Charles Parham founded the modern Pentecostal baptism with speaking in tongues, how Evan Roberts gained worldwide attention through the 1904-05 Welsh revival, and how William Seymour spearheaded an international Pentecostal movement from Azusa Street in Los Angeles in 1906. The reader will learn how Pentecostalism spawned new denominations, national and international ministries, global renewal movements, and inspired innovators to take modern revivalism to a whole new level. Then when Pentecostalism penetrated American Middle-class Protestantism, many observers began speaking of a "third force" in Christianity. Meanwhile, revolutionary changes in the Catholic Church opened the door for the Catholic Charismatic Renewal. Then, just as the charismatic movement was beginning to subside in America, it went global, as charismatic mega churches, Bible schools, and television networks took the message of renewal to the world. The twenty-first century has witnessed a dramatic shift in Christianity to the Southern Hemisphere fueled, in part, by the global rise of Pentecostalism, with many new movements on the horizon.