Lincoln attacked the combined effects of the Kansas-Nebraska Act and the Supreme Court deciding the legality of slavery, in Ottawa, IL

8/21/1858 In the first place what is necessary to make the institution [of slavery] national? Not war. There is no danger that the people of Kentucky will shoulder their muskets and with a young n....r stuck on every bayonet march into Illinois and force them upon us. There is no danger of our going over there and making war on them. Then what is necessary for the nationalization of slavery? It is simply the next Dred Scott decision. It is merely for the Supreme Court to decide that no state under the Constitution can exclude it, just as they have already decided that under the Constitution neither Congress nor the territorial legislature can do it. When that is decided and acquiesced in, the whole thing is done. LL 249