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How did Portugal gain an empire in Brazil?

APortuguese mariners were first to explore the Amazon basin
BThe Treaty of Trodesillas, designed to divide the Atlantic between Spain and Portugal, unintentionally granted Brazil to Portugal
CBrazilian natives successfully resisted Spanish invaders
DThe Spanish had no interest in South America initially

Verified Answer :

The main way in which Portugal gained an empire in Brazil was that "a. Portuguese mariners were first to explore the Amazon basin," however dealings within the church also played a role. 

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