To what extent were the civil rights of African Americans protected during the decades following Reconstruction?

Attempts to protect the civil rights of African Americans after Reconstruction were largely unsuccessful for decades

Explanation:

The reconstruction era began in the confederate states when the American Civil war ended in 1865. The African American were mostly found in Mississippi and South Carolina and there population were said to have equaled that of the whites who inhabited Louisiana. In fear of white black domination, the whites fought against the exercise of political power by freedmen which was the objective of the Fifteenth Amendment to the United States Constitution.

i am sure the answer is d