As the demand for slaves grew, the Portuguese began to enter the interior of Africa to forcibly take captives; as other Europeans became involved in the slave trade, generally they remained on the coast and purchased captives from Africans who had transported them from the interior.
They will look for a bias of the writer, what events and views they hold and how they relate to the writing
They probably played it because of the victory of the battle
Probably (3) Both communist...
..considering the economies of the two nations (almost non-existent) based upon internal market or upon trade with the "mother" communist nations (URSS for East Germany and China for North Korea).