Southern political leaders were threatening to take their states out of the Union if a Republican president was elected on a platform restricting sla… - James M. McPherson

The Alabama Democratic convention [instructed] its delegates to walk out of the national convention if the party refused to adopt a platform pledging a federal slave code for the territories. Other lower-South Democratic organizations followed suit. In February, Jefferson Davis presented the substance of southern demands to the Senate in resolutions affirming that neither Congress nor a territorial legislature could impair the constitutional right of any citizen of the United States to take his slave property into the common territories.

It would be wrong, however, to assume that Confederate soldiers were constantly preoccupied with this matter. In fact, only 20 percent of the sample of 429 Southern soldiers explicitly voiced proslavery convictions in their letters or diaries. As one might expect, a much higher percentage of soldiers from slaveholding families than from nonslaveholding families expressed such a purpose: 33 percent, compared with 12 percent. Ironically, the proportion of Union soldiers who wrote about the slavery question was greater, as the next chapter will show. There is a ready explanation for this apparent paradox. Emancipation was a salient issue for Union soldiers because it was controversial. Slavery was less salient for most Confederate soldiers because it was not controversial. They took slavery for granted as one of the Southern 'rights' and institutions for which they fought, and did not feel compelled to discuss it. Although only 20 percent of the soldiers avowed explicit proslavery purposes in their letters and diaries, none at all dissented from that view. But even those who owned slaves and fought consciously to defend the institution preferred to discourse upon liberty, rights, and the horrors of subjugation.

By the time of the Gettysburg Address, in November 1863, the North was fighting for a 'new birth of freedom' to transform the Constitution written by the founding fathers, under which the United States had become the world's largest slaveholding country, into a charter of emancipation for a republic where, as the northern version of 'The Battle Cry of Freedom' put it, 'Not a man shall be a slave'.