Similarly, Catt repeated an argument developed in 1867 by abolitionist and suffragist Henry B. Blackwell, when Catt was eight years old, to refute claims by Southern suffrage opponents that women's suffrage would undermine white supremacy. Catt expressed this argument most fully in 1917. In her book chapter “Objections to the Federal Amendment.” Catt wrote, “white supremacy will be strengthened, not weakened by women’s suffrage,” and used 1910 Census data to argue that white voters (men and women) will outnumber black voters (men and women) in all Southern states other than Mississippi and South Carolina. Catt, however, goes on to state that this argument, along with other objections to the federal amendment, are “ridiculous” and states that “all people must be included.”