One social effect of colonization was that Colonization created civil war and ethnic violence as the Europeans created borders in their interests only.
When Europeans colonized Africa, they drew up borders that were in their own interests. They did not care for the tribal and ethnic groups that were being put together or separated.
As a result, when African nations gained independence, civil wars and ethnic violence broke out because groups were in nations together when they didn't want to be.
Prime examples include the Biafran war and the Rwandan genocide.
Find out more on the Rwandan genocide at https://brainly.com/question/521450.