"— First inaugural address, 4 March 1861[176][177] Lincoln cited his plans for banning the expansion of slavery as the key source of conflict between North and South, stating "One section of our country believes slavery is right and ought to be extended, while the other believes it is wrong and ought not to be extended. This is the only substantial dispute."The president ended his address with an appeal to the people of the South: "We are not enemies, but friends. We must not be enemies.... The mystic chords of memory, stretching from every battlefield, and patriot grave, to every living heart and hearthstone, all over this broad land, will yet swell the chorus of the Union, when again touched, as surely they will be, by the better angels of our nature."[178] The failure of the Peace Conference of 1861 signaled that legislative compromise was impossible. By March 1861, no leaders of the insurrection had proposed rejoining the Union on any terms. Meanwhile, Lincoln and the Republican leadership agreed that the dismantling of the Union could not be tolerated.