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Dear Ms. Boyd,
Thank you for posting on History Hub!
We searched the National Archives Catalog and located the Population Schedules for the 1920 Census and the Population Schedules for the 1930 Census but were unable to locate a Stempke since all of the Wisconsin images have not been added yet. In the 1920 US Census using Ancestry, John is noted as “Pa” meaning he had started the naturalization process, but have not yet obtained US Citizenship. In the 1930 census he is noted as “Na” meaning he was claiming he completed the naturalization process and was a US Citizen. There may be a fee for viewing these results on Ancestry. Or you may view these records online at one NARA's facilities for free via ALIC. 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/.
Based on these two census years, there should be naturalization paperwork available at the National Archives at Chicago (firstname.lastname@example.org) as they maintain naturalization records from the Federal courts in Wisconsin.
His naturalization paperwork should provide you with additional information regarding his birth date and location as well as his immigration to the US - which may give you more jumping off points to locate additional records about his earlier life. Based on the immigration information recorded, you should potentially be able to locate his passenger arrival record which may include other family members. Additionally, the Austria-Poland (and other nations in that area) lines were blurred for a long period and you certainly see countries listed differently in various decades, so knowing more specifically where he was born could help focus your search for additional records internationally.
Depending on where he was born, there are a number of organizations that focus on genealogy for specific areas within the geographic-region in question. Generally, there are a number of Galicia-specific genealogy websites and organizations that could be useful to your search and are easily located through an internet search on the term “Galicia genealogy.”
We hope this information is helpful. Best of luck with your family research!
[Information provided by Elizabeth Burnes, Subject Matter Expert]