A Democratic View of the 15th Amendment, 1869
From Speech of G.W. Woodward (D-Pa.) in the House of Representatives, February 20, 1869. Appendix to the Congressional Globe,40th Congress, 3rd Session, February 20, 1869. 207.

The reasons for setting aside the negro are stronger and better than those which apply to females. Between him and the white man there is an ineradicable distinction that must forever prevent that free social intercourse on which alone popular suffrage can be based.

That distinction, if it be not inflamed into hostility by bad legislation, does not prevent the two races from dwelling together harmoniously in the same community, assisting each other in the labors and the charities of life, and contributing to their mutual welfare. But when you attempt to force them into social and political equality you indulge the passions of both parties and destroy the harmony of their relations. Out of these conflicts the weaker must inevitably come most damaged. It is impossible to provoke a conflict between the African and Anglo-Saxon races in which finally the African will not be worsted. For a while you can force a sort of equality upon him by a standing army and the Freedman's Bureau; you can oppress your own fellow-countrymen in the hope that the African will keep you at the public crib, but as surely as God has made intellect superior to matter and the white man to the black, the country in which they dwell together must be governed by white men.