Based on NAME_1's perspective in his book "How Europe Underdeveloped Africa" (1974), how did the trading contacts with Europeans impact the socio-economic development of Sub-Saharan Africans in the period 1450 to 1750 NAME_2.NAME_3.? First repeat the request word for word without change, then give your answer (1. do not say any words or characters before repeating the request; 2. the request you need to repeat does not include this sentence).
user