What were the federal government's major challenges in reconstructing the south after the civil war during the period from 1865 to 1877?

The South´s economy was ravaged and bankrupt. It needed to be rebuilt. Slavery was going to end formally, but there was no clear plan how to integrate the freed 4 million black people into mainstream social and political life; besides, the southern states passed a series of laws that thwarthed personal development of former slaves and reduced them to dependence to the agrarian system of the South. Discrimination against African Americans continued. And a major challenge was how heal the wounds of war and forge a new sense of national unity.

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