In 1526, King Afonso of the African kingdom of Kongo wrote a letter to the king of Portugal. In the letter, King Afonso criticized the actions of Portuguese slave
traders who enslaved people from his kingdom.
Is it primary or secondary?

Texas’ gulf coastal plains are the western extension of the coastal plain extending from the atlantic ocean to beyond the rio grande. its characteristic rolling to hilly surface covered with a heavy growth of pine and hardwoods extends into east texas. in the increasingly arid west, however, its forests become secondary in nature, consisting largely of post oaks and, farther west, prairies and brushlands.