The correct answer is "There must be two Americas: one that sets the captive free, and one that takes a once captives new freedom away from him."
That is the phrase from Mark Twain's essay, "The Person Sitting in Darkness," published in February of 1901, that best identifies Twain as an anti-imperialist.
Without a doubt, Mark Twain (1835-1910) is considered to be one of the best writers of the United States. In the case of this essay, it was published in the "North American Review." He used humor and satire in his arguments to expose imperialistic ideas of the time. Mark Twain also wrote two classic novels in the American literature: "The Adventures of Tom Sawyer," and the "Adventures of Huckleberry Finn."