Final answer:
Portugal initiated the transatlantic slave trade from Africa to the Americas.
Step-by-step explanation:
The European state that initiated the transatlantic slave trade from Africa to the Americas was Portugal. The Portuguese were the first to establish trade posts along the coast of West Africa in the 15th century, capturing and transporting enslaved Africans to their colonies in the Americas. They were followed by other European powers, such as Spain, England, France, and the Netherlands, who also participated in the slave trade.
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