The main way in which advances in learning and technology influenced 15th and 16th century european exploration and trade is that the Renaissance Era in Europe brought back an interest in exploration of all kinds--from the sciences to the arts--meaning that people were interested in discovering known things and "worlds".
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They believed if the government got involved, they would abuse that power and dictate the economy.
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Answer:
The Portuguese were using enslaved Africans on sugar plantations in Madeira, a Portuguese island off the west coast of Africa, by 1460. They built the first slave fort in 1481, on the coast of modern Ghana. This was Elmina Castle, the headquarters of the Portuguese slave traders. They were trading slaves for goods.
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