Northerners lost interest in the Reconstruction era because the Northerners got tired of trying to help fix the South's social problems and the Northerners wanted to start working on fixing their own social problems.
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Answer:
I believe it was not possible to avoid the civil war. If it was avoidable, the north and south would have split into two different countries. Since the two are right next to each other, there would have been constant clashes and disagreements. The southern white would have not cooperate with the north to negotiate giving any slaves rights. As I said, war could have been pushed aside, back ultimately come back as the heat between the north and south would be much greater, creating a much more bloodier of a war than it was originally.
