Explain why Reconstruction ultimately failed.

first it didnt fail it was overthrown. The end of Reconstruction is often spoken of in psychological terms, as a collapse of white Americans' nerve, or as a failure of Republican political will, when in cold truth Reconstruction did not fail so much as it was overthrown.

Merely to call Reconstruction a failure is too simplistic. Reconstruction was overthrown, subverted, and betrayed - and then replicated, since many of the same hesitations over costs, internecine politics, and xenophobia led to dreary repetitions of these mistakes after the First World War and after the two Gulf Wars.