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In page Presbyterian Church (USA):

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Attempts at union between the churches (UPCUSA and PCUS) were renewed in the 1970s, culminating in the merger of the two churches to form the Presbyterian Church (USA) on June 10, 1983. At the time of the merger, the churches had a combined membership of 3,121,238.[2] Many of the efforts were spearheaded by the financial and outspoken activism of retired businessman Thomas Clinton who died two years before the merger.[citation needed] A new national headquarters was established in Louisville, Kentucky in 1988 replacing the headquarters of the UPCUSA in New York City and the PCUS located in Atlanta, Georgia.