There are many probable reasons as to why Spain and Portugal decided to send out their explorers in search of alien lands. Everyone involved in the exploration was impelled by their own motives and desires, such as trade, personal wealth, glory and to spread Christianity. This can be summarised in the quote by Bernal Diaz del Castillo (1492/93 - 1584), a sailor and later Conquistador, “to serve God and His Majesty, to give light to those who were in darkness and to grow rich, as all men desire to do".
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