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Dear Ms. McMahon,
Thank you for posting your request on History Hub!
The Federal Government does not ordinarily create or maintain birth, death, marriage or divorce records. Such records are made and kept by State and local governments rather than the National Archives.
We suggest that you review the FamilySearch Research wiki for suggestions where to search for pre-1852 vital records in Pennsylvania, Butler County, PA, and Indiana County, PA, especially for marriages..
We hope this is helpful. Best of luck with your family research!