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Aimee Semple McPherson (Aimee, in the original French; October 9, 1890 - September 27, 1944), also known as Sister Aimee or simply Sister, was a Canadian-American Pentecostal evangelist and media celebrity in the 1920s and 1930s, famous for founding the Foursquare Church. McPherson has been noted as a pioneer in the use of modern media, because she used radio to draw on the growing appeal of popular entertainment in North America and incorporated other forms into her weekly sermons at Angelus Temple, one of the first megachurches. In her time she was the most publicized Christian evangelist, surpassing Billy Sunday and her other predecessors. She conducted public faith healing demonstrations before large crowds; testimonies conveyed tens of thousands of people healed.

By early 1926, McPherson had become one of the most charismatic and influential women and ministers of her time. Her fame equaled, to name a few, Charles Lindbergh, Johnny Weissmuller, Jack Dempsey, Babe Ruth, Ty Cobb, Knute Rockne, Bobby Jones, Louise Brooks, and Rudolph Valentino. She was a major American phenomenon, who along with some other high-profile preachers of the time, unlike Hollywood celebrities, could be admired by their adoring public, "without apparently compromising their souls."  According to Carey McWilliams, she had become "more than just a household word: she was a folk hero and a civic institution; an honorary member of the fire and police departments; a patron saint of the service clubs; an official spokesman for the community on problems grave and frivolous." She was influential in many social, educational and political areas. McPherson made personal crusades against anything that she felt threatened her Christian ideals, including the drinking of alcohol and teaching evolution in schools.  McPherson became a strong supporter of William Jennings Bryan during the 1925 Scopes trial, in which John Scopes was tried for illegally teaching evolution at a Dayton, Tennessee, school. Bryan and McPherson had worked together in the Angelus Temple and they believed Darwinism had undermined students' morality. According to The New Yorker, McPherson said, evolution "is the greatest triumph of Satanic intelligence in 5,931 years of devilish warfare, against the Hosts of Heaven. It is poisoning the minds of the children of the nation." She sent Bryan a telegram saying, "Ten thousand members of Angelus Temple with her millions of radio church membership send grateful appreciation of your lion-hearted championship of the Bible against evolution and throw our hats in the ring with you." She organized "an all-night prayer service, a massive church meeting preceded by a Bible parade through Los Angeles."
Aimee Semple McPherson