played key role in opening doors for African Americans in government.

Reconstruction & 15th amendment

Explanation:

During the reconstruction period, many organizations were established to help African American communities take up the education, job opportunities, and health care that they never received during their slavery day. This help them make a decision on which key issues they wanted to support In United States' politic.

The second factor that helped them was the creation of the 15th amendment. Prior to this amendment, only White men were allowed to vote in the government. After this amendment, the African American people could vote for a representative that they trust to fight for their behalf within the government body.

answer; i believe that the correct answer is ( troxel v. granville);