What is a good organizing topic for the post–civil war era?

Reconstruction is a good organizing topic for the post–Civil War era.

Explanation:

When the Union tasted the fruit of victory in 1865's Civil War, it provided the saves with the freedom. Also, there was huge damage in the South that made the South economically poor. Soon after passing the Abolishment act President Lincoln was assassinated.

Then the presidency was automatically given to Andrew Johnson. Andrew always had thoughts the same as Lincoln had. They wanted to rebuild the South back so Johnson announced the plan of  "Reconstruction". That reflected in both Unionism and in the state's rights. With the help of the Union army, the lands were built back.

Thus the rebuilt lands were provided to the freed slaves by the Freedmen Bureau and Union Army. The Reconstruction plan existed till 1877 and it stopped due to the rise of southern whites' violence. Because of the changes made by Congress in the Reconstruction plan that turned it into a Radical Reconstruction plan.

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the answer is prolly b