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Foursquare Church, founded by Aimee Semple McPherson in the 1920s, is a Pentecostal denomination known for its emphasis on evangelism, healing, and the baptism of the Holy Spirit. McPherson, a charismatic preacher and faith healer, played a significant role in shaping the Pentecostal movement in the United States. Foursquare Church continues to operate as a global network of churches with a strong missionary outreach.