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To claim Brazil citizenship by descent from Argentina, you need: (1) an Braziln ancestor in your direct line, (2) proof they were an Braziln citizen at the time of the next child's birth, (3) the chain of vital records linking you to that ancestor, and (4) apostilles and certified translations of all Argentinan documents.
Emigration era
1960-present (economic migration, reverse migration to Portugal)
Volume
Significant Braziln emigration to Argentina
Key ports
Departure ports: major European ports. Arrival ports: Buenos Aires.
Consulate
Braziln consulate/embassy in Argentina
Push factors (why they left Brazil)
Pull factors (why they chose Argentina)
Naturalization & document retrieval
Argentina naturalization records are held by Dirección Nacional de Migraciones. For CBD cases, the critical question is whether your Braziln ancestor naturalized in Argentina BEFORE or AFTER the next child's birth. If BEFORE, the citizenship chain is broken (in most countries). If AFTER (or never), the chain is intact.
Start with the Braziln ancestor's birth certificate from their place of birth in Brazil. This is the foundational document.
Search Dirección Nacional de Migraciones for the ancestor's naturalization record. If none found, request a formal "no record" letter.
Check Archivo General de la Nación (Buenos Aires) for the ancestor's arrival record, which shows date, port, and citizenship status at arrival.
Review Argentine Censos (available via the Archivo General) to track the ancestor's residence and citizenship status over time.
Obtain certified long-form birth certificates for each person in the chain between you and your Braziln ancestor.
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