Iberia's children: A short history of why Portuguese and Spanish

Once upon a time, Portuguese and Spanish were, basically, dialects of the same language: Latin, the language of the Roman Empire. Hundreds of years later, how have Portuguese and Spanish grown apart, and why? And will they always be different?

Queen Isabella of Castile's rise to power in Spain

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PDF) Genetic history of Spain and Portugal

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A Concise History of Spain by William D. Phillips Jr.

Iberia's children: A short history of why Portuguese and Spanish

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