US History: Chapter 6, Exercise 2 — Possible Solution
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CORRECTION
That view is the Dunning School's, which dominated from about 1900 into the
1930s and textbooks into the 1960s, arguing (per historian Adam Fairclough)
that "black suffrage had been a political blunder." It was challenged
starting with W.E.B. Du Bois's 1935 Black Reconstruction in America, and later
historians including Kenneth Stampp and Eric Foner rejected its racial
assumptions. The source calls it "substantially discredited" by the mid-20th
century.

REWRITE
"An interpretation of Reconstruction as a failure caused by freedmen's
unfitness dominated scholarship for decades but has since been discredited."