History serving “a social aim,” rather than chronicling the past in a detached manner, is what readers get in A People’s History of the United States. With any luck, “The People Speak,” the History Channel documentary based on the book that premieres this Sunday, will be, like so many Hollywood productions, unfaithful to the original. Given A People’s History of the United States’ infidelity to facts, this might be the only chance viewers have of seeing anything resembling an accurate retelling of history.Through Zinn’s looking-glass, Maoist China, site of history’s bloodiest state-sponsored killings, transforms into “the closest thing, in the...