The Welsh Revival sparked revivals all over the world—in the Kassia Hills in India, and at Azusa in Pasadena. God used William Seymour, a black man, son of a slave, to lead the most extraordinary and powerful manifestation of His presence in the twentieth century. Fire fell from heaven on the lowly building where the mixed-race prayer group met, a shekinah glory cloud was often seen to fill the place, extraordinary healings happened at the hands of teenagers, and a spirit of racial unity was manifested in the middle of the most racially divisive time in U.S. history. In addition, God used Azusa to reintroduce the biblical manifestation of the gift of tongues, which became a cardinal doctrine of the denominations that resulted. Ordinary people were learning how to minister in the power of the Holy Spirit.