Final answer:
Northern divisions during the Civil War included significant splits among both Republicans and Democrats. The Copperheads, or Peace Democrats, opposed the war, while the 'War' Democrats supported a more aggressive stance. Post-Civil War shifts in party alignment saw African Americans largely support Republicans until the Great Depression.
Step-by-step explanation:
During the Civil War, Northern divisions included those among both Republicans and Democrats. The Democratic Party faced a significant rift; for instance, the Copperheads were a group of Peace Democrats who opposed the Civil War and were particularly prevalent in the Midwest.
They were critical of President Abraham Lincoln's exercise of power during the war. On the other side, there were also "War" Democrats who supported a more aggressive policy against the South.
This internal division among the Democrats was significant during the war, and in terms of party alignment, after the Civil War, many African Americans supported the Republican Party, being the party of Lincoln and emancipation, until a shift occurred during the Great Depression when Democrats began to include African Americans and other minorities in their coalition.
The Northern divisions during the Civil War included Republicans and Democrats. The Republicans, also known as the party of Lincoln, supported the abolition of slavery and were viewed as the party that had freed the enslaved. The Democrats, on the other hand, had largely supported slavery before the Civil War and opposed efforts to integrate African Americans into society after they were liberated.