カンザス・ネブラスカ法
Douglas's proposal, which would come to be known as the Kansas–Nebraska Act, provoked a strong reaction in the North, where the repeal of the Missouri Compromise was unpopular. Douglas argued that the Compromise of 1850 had already superseded the Missouri Compromise, and argued that the citizens of the territories should have the right to determine the status of slavery. Opponents of popular sovereignty attacked its supposed fairness; Abraham Lincoln claimed that Douglas "has no very vivid impression that the Negro is human; and consequently has no idea that there can be any moral question in legislating about him". Nonetheless, the Kansas–Nebraska Act won passage in both houses of Congress, albeit narrowly in the House of Representatives. In both the House and the Senate, every Northern Whig voted against the Kansas–Nebraska Act, while just under half of the Northern Democrats and the vast majority of Southern congressmen of both parties voted for the act. Northern opponents of the act saw it as a triumph for the hated Slave Power. Douglas had hoped that the Kansas–Nebraska Act would help ease sectional tensions, and he was surprised by the intensity of Northern backlash to his proposal and to Douglas himself. He later remembered, "I could travel from Boston to Chicago by the light of my own effigy."