这些紧张局势的起因是移民和就业竞争等。 在非洲，由殖民者人为划定的边界已难以维持，不同部落和种族群体试图开拓其自身的领土空间。
In Africa, artificial borders that were drawn by colonial powers are becoming untenable, as different tribes and ethnic groups attempt to carve out their own territorial spaces.