On a timeline, a milestone 12 years in the future will be to the of a milestone 13 years in the future and to the of a milestone 17 years in the future

I believe you are looking for left in both cases

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The two social institutions, and they help African Americans navigate their new reality is described below in detail.

Explanation:

The Civil War and Reconstruction era created important administrative, economic, and social changes in the United States, but for African Americans, the course had combined outcomes at best. The legacy of the Civil War involved the central proposal of what liberty means surpassing the dissolution of the system of slavery. the primary roots from the Reconstruction period and examine two archivists’ arguments on its impacts on the entities of African Americans.