Once a slave ship had a full cargo of enslaved Africans, the captain would set out on the next leg of the journey. This leg, called the Middle Passage , took the Africans away from their homeland, across the Atlantic Ocean to the Americas.
D. Learning from the ottoman way of waging war and conquering vast territory
It is based around a king.
Japan has many mountains, thus, the outsiders could not easily enter Japan and Japanese could not leave the country. And, thus the self-isolation was helped by the presence of a mountain terrain. This policy was implemented by Togukawa, who insisted on preventing Japan from foreigners.