Johannsen, Robert W., "Douglas, Stephen Arnold," American National Biography Online, February 2000, http://www.anb.org/articles/04/04-00325.html.
Douglas's dilemma became clear in 1854 when the issue of slavery in the territories was revived by the passage of the Kansas-Nebraska Act. Written and introduced by Douglas, the act organized two new territories out of the old Louisiana Purchase area. Although slavery had been barred from the region by the 1820 Missouri Compromise, Douglas nonetheless provided for popular sovereignty...Southerners, however, pressed him for an explicit repeal of the Missouri Compromise, and Douglas agreed in order to secure the bill's passage, although he predicted it would raise a "hell of a storm." Antislavery opponents denounced the repeal as a "gross violation of a sacred pledge" and a betrayal of freedom made to promote Douglas's ambitions.