Which of these European nations made a concerted effort to involve itself in the African slave trade in the mid-fifteenth century?

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Portugal is known to have made a concerted effort to involve itself in the African slave trade in the mid-fifteenth century. This was largely due to Prince Henry the Navigator, who sponsored expeditions down the West African coast, eventually leading to the establishment of trading posts and the capture of slaves.

Which of These European Nations Made a Concerted Effort to Involve