The geographic features of the African Continent are partly responsible for the 1. use of French or English as the official language of many African nations 2. diversity of cultures found in Africa 3. decline of the slave trade in the 19th century 4. recent advances in technology in African nations 25.. use of French or English as the official language of many African nations. 2. diversity of cultures found in Africa. 3. decline of the slave trade in the 19th century. 4. recent advances in technology in African nations. 25.