Aimee Elizabeth Semple McPherson, also known as Sister Aimee or Sister, was a Canadian-born American Pentecostal evangelist and media celebrity in the 1920s and 1930s, famous for founding the Foursquare Church. McPherson pioneered the use of broadcast mass media for wider dissemination of both religious services and appeals for donations, using radio to draw both audience and revenue with the growing appeal of popular entertainment and incorporating stage techniques into her weekly sermons at Angelus Temple, an early megachurch.

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