On 6 November 1860, the six-year-old Republican Party elected its first president. During the tense crisis months that followed – the “secession winter” of 1860–61 – practically all observers believed that Lincoln and the Republicans would begin attacking slavery as soon as they took power. Democrats in the North blamed the Republican Party for the entire sectional crisis. They accused Republicans of plotting to circumvent the Constitutional prohibition against direct federal attacks on slavery. Republicans would instead allegedly try to squeeze slavery to death indirectly, by abolishing it in the territories and in Washington DC, suppressing it in the high seas, and refusing federal...