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The commodity was precious rocks such as gold, and also other natural resources such as sugar, chocolate, tobacco, and potatoes.
When Christopher Columbus received the patronage of the Kings of Spain, Ferdinand de Aragon, and Isabella del Castille, the Spanish monarchs ambitioned new territories and to exploit raw materials and natural resources to get the kingdom richer. That is why the Spanish explorers ambitioned to exploit those raw materials found in the Caribbean Islands when Colon discovered America on October 12, 1492.