...y Harriet Martineau, on the Manifest Destiny of the American Union], wrote Mrs. M. W. Chapman to Mr. Garrison, was, I find by comparison of dates, written at a time when no two papers in the United States agreed as to what the Dred Scott decision did mean—all the A. S. papers agreeing that if it meant anything, it meant the extension of slavery throughout the States. . . . I should really like t...