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To claim Argentina citizenship by descent from Brazil, you need: (1) an Argentinan ancestor in your direct line, (2) proof they were an Argentinan 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 Braziln documents.
Emigration era
1970-present (economic and political migration, reverse migration to Italy/Spain)
Volume
Significant Argentinan emigration to Brazil
Key ports
Departure ports: major European ports. Arrival ports: Santos (São Paulo), Rio de Janeiro.
Consulate
Argentinan consulate/embassy in Brazil
Push factors (why they left Argentina)
Pull factors (why they chose Brazil)
Naturalization & document retrieval
Brazil naturalization records are held by Ministério da Justiça. For CBD cases, the critical question is whether your Argentinan ancestor naturalized in Brazil 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 Argentinan ancestor's birth certificate from their place of birth in Argentina. This is the foundational document.
Search Ministério da Justiça for the ancestor's naturalization record. If none found, request a formal "no record" letter.
Check Arquivo Nacional (Rio de Janeiro) for the ancestor's arrival record, which shows date, port, and citizenship status at arrival.
Review Brazilian Censos (available via IBGE) 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 Argentinan ancestor.
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