What do most contemporary historians regard as the reason Congressional Reconstruction failed?

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Most contemporary historians believe that Congressional Reconstruction failed primarily because the federal government did not aggressively respond to southern white resistance. This lack of a strong federal response allowed white supremacist groups and other opponents of Reconstruction to undermine its goals and terrorize African Americans and their allies, leading to the eventual failure of Reconstruction efforts to fully secure rights and protections for the newly freed African American population.

What Do Most Contemporary Historians Regard as the Reason Congressional