Answer: Ethnic groups
Step-by-step explanation:
Africa is a very diverse continent with many ethnic groups such as the Igbo, Yoruba, Tswana, Hausa, Zulu and Xhosa. These tribes speak different distinct languages and have rich individual culture.
The partitioning of Africa by the Europeans did not care about these tribes as they only cared about getting more land. This led to groups being separated across borders such as with the Tswana of South Africa and Botswana.
It also placed enemy groups in the same country such as the Tiv and Junkun people which has led to many conflicts in Africa.