Non-intervention--popular sovereignty [electronic resource] : speech of Hon. S.A. Douglas, of Illinois, in the Senate of the United States, February 23, 1859 : in reply to Hon. A.G. Brown, of Mississippi, in opposition to the passage of a code of laws by Congress to protect slavery in the territories, and in favor of banishing from the halls of Congress all questions touching domestic slavery in the territories : together with an appendix showing the position of distinguished public men on this question in the great contests of 1854 and 1856.