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Dear Mr. White,
Thank you for posting your request on History Hub!
We suggest that you review NARA’s Resources for Genealogists, as well as the History Hub Blog titled Suggestions and Advice for Family History Researchers. Also, the FamilySearch Research wiki for Dubuque County, Iowa Genealogy and England Genealogy may be useful.
We searched the National Archives Catalog and located the Population Schedules for the 1860 Census, the Population Schedules for the 1870 Census, the Population Schedules for the 1880 Census, the Population Schedules for the 1890 Census; the Population Schedules for the 1900 Census in the Records of the Bureau of the Census (Record Group 29) that may contain information about William Tamlin in Iowa. For more information about the non-digitized schedules, please contact the National Archives at Washington, DC - Textual Reference (RDT1) via email at firstname.lastname@example.org.
You may wish to search Ancestry or FamilySearch for the U.S. Census. There may be a fee for using Ancestry. Instead, please check for access at your local library as many library systems subscribe to these sites, making them free for their patrons.
In general, naturalization was a two-step process that took a minimum of five years. After residing in the United States for two years, an alien could file a "declaration of intention" ("first papers") to become a citizen. After three additional years, the alien could "petition for naturalization" (”second papers”). After the petition was granted, a certificate of citizenship was issued to the alien. These two steps did not have to take place in the same court.
If a naturalization took place in a Federal court, naturalization indexes, declarations of intention (with any accompanying certificates of arrival), and petitions for naturalization will usually be in the National Archives facility serving the state in which the Federal court is located. Since he lived in Iowa, we suggest contacting the National Archives at Kansas City (RM-KC) at email@example.com. No central index exists. To ensure a successful request with the National Archives, researchers should include: the name of petitioner (including known variants); date of birth; approximate date of entry to the US; approximate date of naturalization; where the individual was residing at the time of naturalization (city/county/state); and country of origin.
Given the time period that your great grandfather lived in the United States, it is possible that he served in the Civil War. We searched the National Archives catalog and located the series Consolidated Enrollment Lists, 1863- 1865 from the Records of the Provost Marshal General’s Bureau (Civil War), 1861- 1907 (Record Group 110) containing the file unit Iowa, 3rd Congressional District, Class NO.1 that may contain a William Tamlin. These records have been digitized and are available using the Catalog. We also located the series Indexes to the Carded Records of Soldiers Who Served in Volunteer Organizations During the Civil War in the Records of the Adjutant General's Office, 1762 - 1917 (Record Group 94) and the series Carded Records Showing Military Service of Soldiers Who Fought in Volunteer Organizations During the American Civil War in the Records of the Adjutant General's Office, 1762 - 1917 (Record Group 94) that may include a file for William Tamlin from Iowa. The records for Iowa have not been digitized. For more information about the non-digitized records, please email the National Archives at Washington, DC - Textual Reference (RDT1) at firstname.lastname@example.org.
Due to the continued impact of COVID-19, you may experience a delay in receiving an initial acknowledgment as well as a substantive response to your reference request from RDT1 and RM-KC. We apologize for this inconvenience and appreciate your understanding and patience as we balance mission-critical work and the safety of our staff during the pandemic. Please check NARA’s web page about COVID-19 updates for the latest information.
For information about your great grandfather while he lived in England, we suggest you contact The National Archives of the United Kingdom, Kew, Richmond, Surrey, TW9 4DU, United Kingdom.
We hope this is helpful. Best of luck with your family research!