Few events have affected modern church history as greatly as the famous Azusa Street revival of 1900-1909, which ushered into being the worldwide twentieth-century pentecostal renewal. From this single revival has issued a movement which by 1980 numbers over 50,000,000 classical Pentecostals in uncounted churches and missions in practically every nation of the world. In addition to these Pentecostals, there are untold numbers of charismatics in every denomination who can trace at least part of their spiritual heritage to the Azusa Street meeting.