Answer and Explanation:
I believe you are referring to the violence faced by African-Americans during the Southern Reconstruction, which was the period after the American Civil War, when the federal government determined how southern states should be rebuilt and dominated. During this period, African-Americans stopped being slaves, which has already stimulated the ire of the white population. However, events such as the integration of African-Americans in society, political participation and presence in educational institutions, stimulated even more anger, as the white population could not support that blacks had the same social value as them and feared, that the whole society was dominated by blacks. For this reason, they initiated several acts of violence against blacks, which terrified the African American population and created racial instability, racism and inequalities in society.