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Dear Mr. Metter,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Petitions for Naturalization, 1903 - 1972 in the Records of District Courts of the United States (Record Group 21) that includes a digitized file unit titled Petition for Naturalization of Joseph Stadler.
We searched Ancestry and located the Ohio Birth & Christening result for Joseph Stadler that lists his race as white; Joseph's grave site in California; and his father’s grave site in Ohio which lists his birthplace as Germany (also includes names of family members). There may be a fee for using Ancestry. Instead, you may view these records online at one NARA's facilities for free via a NARA PC. For the nearest NARA location, please consult our web page at https://www.archives.gov/locations/. Also, some of the images from Ancestry are available for free on Family Search at https://www.familysearch.org/en/.
We suggest that you review the website of the Ohio State Archives Birth Records to obtain a copy of his birth record and California State Archives Vital Records to obtain a copy of his death certificate. You also may wish to search Cleveland Leader for photographs that disproved the claim of Joseph Stadler race; Joseph Stadler; and Photo Essay - African American Olympians websites for additional information.
We hope this is helpful. Best of luck with your research!
Thank you for your helpful and thorough response.