How to Prove an Ancestor Never Naturalized

Michael Soucek·Last reviewed: May 2026

Educational information only — not legal advice. Always verify requirements with the relevant government authority, consulate, or registry office.

Many citizenship-by-descent cases hinge on a single question: did your immigrant ancestor ever become a citizen of another country? For people tracing U.S. immigrant ancestors, this usually means determining whether and when the ancestor naturalized as a U.S. citizen — and whether that naturalization happened before or after the next generation in your line was born.

Why Naturalization Timing Matters

The core rule in most European jure sanguinis systems is that citizenship passes generation by generation at birth. If your ancestor gave up their original citizenship before their child was born, the chain is broken and nothing passes to that child — or to you.

Italy provides the clearest example: if your Italian great-grandfather naturalized as a U.S. citizen in 1910, but his child (your grandparent) was born in 1908, the chain survives because he was still Italian when that child was born. But if the child was born in 1912 — after naturalization — the Italian citizenship never passed. Germany applies a similar rule under §4 StAG.

Italy pre-1912 vs. post-1912: Under the old Italian Nationality Law of 1912 (Law 555/1912), Italian citizens who naturalized abroad automatically lost Italian citizenship at the moment of naturalization. Under earlier law (pre-1912), the rules were less codified. Some consulates will ask specifically whether your ancestor naturalized before or after the 1912 law took effect, because prior law matters when assessing when citizenship was technically lost.

German 10-year rule: For German citizenship by descent cases, §25 of the old Reichs- und Staatsangehörigkeitsgesetz (RuStAG 1913) provided that Germans who acquired a foreign nationality automatically lost German citizenship. However, a separate provision allowed Germans living continuously abroad to lose citizenship if they had resided outside Germany for more than 10 years without registering at a German consulate. If your ancestor never naturalized but was abroad for over a decade, German citizenship could still have lapsed under this provision — a frequently overlooked complication.

Rules vary significantly by country and by the year of naturalization. Always verify the specific law with the relevant consulate or a qualified immigration attorney.

The USCIS Genealogy Program

The USCIS Genealogy Program is the primary federal gateway for requesting historical immigration and naturalization records for people who have been deceased for more than 50 years (or were born more than 100 years ago). It operates under USCIS but does not handle the same records processed for current immigration cases.

Form G-1041: Index Search Request

Form G-1041 is a records index search request. You submit it when you want USCIS to search their historical index for records related to your ancestor. The search costs $65 per person per record type (as of 2025). USCIS will tell you whether a record exists and provide a summary of what file types are available.

Form G-1041A: Record Request

Once you know records exist, Form G-1041A requests the actual documents. The fee is $65 per person per record type. Processing time varies: USCIS estimates 90–120 business days for standard processing (roughly 5–6 months), though many researchers report longer waits depending on the record type and volume. Expedited processing is not available.

Certificate of Non-Existence of Record

If USCIS searches their records and finds no evidence of a naturalization, they can issue a Certificate of Non-Existence of Record (CNER) or similar negative result letter. This letter is important: several European consulates — including many Italian consulates — require either a naturalization certificate showing when the ancestor naturalized, or official documentation that no federal naturalization record exists, before they will process a jure sanguinis claim.

Note that a USCIS CNER covers only federal naturalization records held by USCIS. State and local court naturalizations (the most common route before 1906) are not in the USCIS system. You will need to conduct separate searches at the relevant state archives and county courts.

NARA: National Archives and Records Administration

NARA holds the most comprehensive collection of historical naturalization records in the United States. The key record groups to know:

Record Group 85 — INS Records

Contains records of the Immigration and Naturalization Service, including index cards for naturalizations filed in federal courts after 1906, and some state/local court records received under the 1906 Naturalization Act. The NARA "A-Files" (alien registration files) are also in this group for people who registered under the Alien Registration Act of 1940.

Record Group 21 — Federal Court Records

Contains records from U.S. District Courts and predecessor courts, including declarations of intention (first papers) and petitions for naturalization filed in federal court. Records are held at NARA regional facilities organized by circuit/district.

Soundex Index on Microfilm (M1674 and others)

NARA and FamilySearch have microfilmed indexes organized by Soundex code covering many court-filed naturalizations. These are searchable digitally through FamilySearch.org and Ancestry.com and are a fast first search step.

Access: Many NARA records are available online through Ancestry.com, FamilySearch, Fold3, and directly at nara.gov. In-person research is possible at NARA's regional facilities. Requests for non-digitized records typically take 4–8 weeks.

State and County Court Records (Pre-1906)

Before the Naturalization Act of 1906, any court of record — federal, state, or local — could naturalize an immigrant. This means thousands of naturalizations were processed in county probate courts, superior courts, common pleas courts, circuit courts, and other local venues. These records were NOT sent to the federal government and are NOT in the USCIS or NARA federal databases.

To find pre-1906 naturalizations, you need to:

Identify the county where your ancestor lived (U.S. census, city directories, death records).
Contact the county clerk or state archives for that county to ask whether naturalization records from that period are held locally or have been transferred.
Search state archives — many states have microfilmed or digitized their court naturalization records. FamilySearch has indexed large collections for New York, Pennsylvania, Ohio, Illinois, and other high-immigration states.
Check Ancestry.com's state naturalization collections (look under "Immigration & Emigration" → state name).

After 1906, all naturalizations were required to go through federal courts, so the USCIS/NARA databases become much more reliable. If your ancestor arrived after 1906 and you find no federal record, the risk is that they naturalized in a state court under a transitional period, or that records were lost or misfiled.

U.S. Census Citizenship Codes (1900–1940)

U.S. decennial censuses from 1900 through 1940 asked about citizenship status for foreign-born residents. The census columns to look for are labeled AL, PA, and NA — sometimes written out as Al, Pa, Na or using abbreviations:

AL (Alien) — the person had not yet filed any naturalization papers and was still a foreign national.
PA (First Papers / Declaration of Intention) — the person had filed a declaration of intention to become a citizen ("first papers") but had not yet completed naturalization. This means they were not yet a U.S. citizen at the time of the census.
NA (Naturalized) — the person had completed the full naturalization process and was a U.S. citizen at the time of the census.

The citizenship column appears under different headings in different census years:

1900 census: Column "Citizenship" for males 21 and over; coded AL/PA/NA.
1910 census: Same citizenship column, same codes.
1920 census: Column "Naturalization" — same codes but column layout differs.
1930 census: "Citizenship of foreign born" column — codes include NA (naturalized), PA (first papers), and AL.
1940 census: "Citizenship or naturalization status" — codes the same.

Critical caveat: Census data is self-reported and was recorded by enumerators who sometimes misunderstood or mis-recorded answers. A census showing "AL" (Alien) in 1910 does not definitively prove the person never naturalized — they may have naturalized in 1911. A "PA" entry shows they had filed intent but were not yet a citizen on census day. Always cross-reference with court records, not census data alone.

The 1940 census is the last to include citizenship columns. After 1940, finding naturalization status requires primary source documents. Ancestry.com, FamilySearch, and the National Archives have all major censuses digitized and searchable.

Country-Specific Consulate Requirements

Different consulates require different documentation to prove non-naturalization. Some practical notes:

Italian consulates

Most Italian consulates require either (a) a copy of your ancestor's naturalization certificate showing the exact date of naturalization, or (b) documentation showing no federal record exists. The U.S. courts' naturalization certificate or a NARA-certified copy satisfies (a). For (b), many consulates will accept a USCIS CNER combined with a letter from the relevant state archives or county court confirming no record is on file locally. Requirements vary by consular jurisdiction — always check the specific consulate's document list.

German agencies (BVA)

The Bundesverwaltungsamt (Federal Office of Administration) handles German citizenship determination requests. For §25 RuStAG/StAG loss-of-citizenship questions, they will want evidence of the date and circumstances of foreign naturalization. If no naturalization occurred, providing census records (with AL/PA codes), NARA index search results, and a state/county no-record letter builds a strong evidentiary package.

Polish and Hungarian consulates

Both countries require proof that citizenship was not lost through voluntary foreign naturalization. Polish consulates in the U.S. commonly accept a combination of USCIS genealogy records and NARA index results. Hungarian consulates often require similar documentation and may ask for sworn translations.

Czech Republic and Slovakia — a different framework

Czech and Slovak citizenship claims operate under a fundamentally different legal theory than Italy or Germany, and the naturalization question is handled differently as a result.

Czech Republic (Act 186/2013, §31(3), amended 2019): This law allows descendants to reclaim Czech/Czechoslovak citizenship by declaration — not a discretionary application. Critically, the law covers descendants of those who lost citizenship by any means before December 31, 2013, including voluntary naturalization abroad. An ancestor who naturalized as a U.S. citizen in 1952 does NOT automatically bar a descendant's Czech claim under this route — what matters is that the ancestor held Czechoslovak citizenship at some point and that the loss occurred within the covered period (broadly 1945–2013). This inverts the Italian/German approach: instead of proving the ancestor never naturalized, you need to prove they were a citizen at some point and document when and how the citizenship was lost.

Slovakia (Act 40/1993, 2022 amendment): Slovakia's 2022 reform similarly allows descent claims for ancestors who emigrated during the Communist period (1948–1989) and naturalized abroad, treating Communist-era emigrant naturalization as not necessarily extinguishing the claim line. Research focus shifts from USCIS/NARA naturalization records to proving: (a) the ancestor held Czechoslovak/Slovak citizenship, and (b) their citizenship was lost in a context covered by the restitution framework.

U.S.–Czechoslovakia Treaty of 1928: The Treaty of Friendship, Commerce and Navigation between the U.S. and Czechoslovakia (signed 1928) included provisions about nationality that allowed, in limited circumstances, dual status. This treaty is primarily historical context today — post-1948 Communist-era law, the 1993 Czech-Slovak dissolution, and modern restitution legislation have superseded most treaty-era citizenship provisions for practical purposes. However, researchers working on pre-1948 claims may encounter references to the treaty in archival documents and consular correspondence.

Practical records for Czech/Slovak research: Instead of focusing on a USCIS Certificate of Non-Existence, Czech/Slovak researchers should obtain: (1) evidence that the ancestor was a Czechoslovak citizen (internal passport, Czech/Slovak vital records, pre-departure consular registration); (2) U.S. immigration records showing their arrival as an alien; and (3) if applicable, evidence of the political or emigration context (Cold War emigration records, political asylum documentation). Czech consulates will assess the §31(3) eligibility based on these documents rather than on a non-naturalization certificate.

Other Useful Record Types

Alien Registration Records (AR-2 cards, 1940): Under the Alien Registration Act of 1940, all non-citizens 14 and older were required to register. An existing AR-2 card strongly suggests the person was still an alien in 1940. Requests go through USCIS Genealogy Program.
Passport applications: NARA holds U.S. passport applications. If your ancestor applied for a U.S. passport, the application will show their citizenship status at the time — naturalized citizens were required to attach their naturalization certificate.
Social Security death records and SS-5 applications: The SS-5 (Social Security application) sometimes lists birthplace and citizenship-related information. Access through SSA genealogy requests.
Military draft registration cards (WWI and WWII): Draft cards often record citizenship or alien status. Digitized and available on Ancestry.com and FamilySearch.
Voter registration records: Before motor-voter reforms, voter registration sometimes required citizenship proof. State archives may have old voter rolls showing whether a person registered as a citizen.

Building Your Evidence Package

A credible proof-of-non-naturalization package typically consists of multiple sources used together:

USCIS G-1041/G-1041A results — shows whether any federal naturalization record exists (required by most consulates).
NARA index search results — cross-checks the federal database independently.
State archives / county court no-record letter — addresses pre-1906 state court naturalizations.
Census evidence — 1900, 1910, 1920, 1930 census entries showing AL or PA status corroborate the absence of naturalization up to those dates.
Alien registration record (1940) — if available, is strong direct evidence of alien status as of 1940.
Death certificate — if the ancestor died without naturalization, the death certificate may list citizenship status or birthplace (suggesting alien status).

No single document is definitive on its own. Consulates are looking for a consistent picture across multiple sources. If records were destroyed (common for fires in county courthouses), documenting the record destruction and providing all available secondary evidence is the accepted substitute.