Pentecostalism emerged in the early 20th century among radical adherents of the Holiness movement, who were energized by revivalism and expectation for the imminent Second Coming of Christ. Believing that they were living in the end times, they expected God to spiritually renew the Christian Church, and bring to pass the restoration of spiritual gifts and the evangelization of the world. In 1900, Charles Parham, an American evangelist and faith healer, began teaching that speaking in tongues was the Bible evidence of Spirit baptism. Along with William J. Seymour, a Wesleyan-Holiness preacher, he taught that this was the third work of grace. The three-year-long Azusa Street Revival, founded and led by Seymour in Los Angeles, California, resulted in the growth of Pentecostalism throughout the United States and the rest of the world. Visitors carried the Pentecostal experience back to their home churches or felt called to the mission field. While virtually all Pentecostal denominations trace their origins to Azusa Street, the movement has had several divisions and controversies. An early dispute centered on challenges to the doctrine of the Trinity. As a result, the Pentecostal movement is divided between trinitarian and nontrinitarian branches, resulting in the emergence of Oneness Pentecostals.