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The Azusa Street Revival, the primary catalyst for the spread of Pentecostalism in the 20th century, opened in Los Angeles.

Azusa Street Revival

Historic Pentecostal revival meeting

The Azusa Street Revival was a historic series of revival meetings that took place in Los Angeles, California. It was led by William J. Seymour, an African-American preacher. The revival began on April 9, 1906, and continued until roughly 1915.
Source: Wikipedia (CC BY-SA)

Pentecostalism

Denominational renewal movement of Protestant Christianity

Pentecostalism or classical Pentecostalism is a movement within the broader Evangelical wing of Protestant Christianity that emphasizes direct personal experience of God through baptism with the Holy Spirit. The term Pentecostal is derived from Pentecost, an event that…
Source: Wikipedia (CC BY-SA)