Some states mentioned slavery in their declarations of secession, others did not. Most Confederate soldiers were not slaveholders and fought out of loyalty to their states. Ending slavery in the areas under Confederate control (but not the loyal slave states) became the Union aim only as of January 1, 1863, almost 18 months after the first battle of Manassas/Bull Run. Lincoln’s call for troops at the beginning of the war was to “suppress rebellion” not to end slavery.
“Lincoln’s call for troops at the beginning of the war was to “suppress rebellion” not to end slavery.”
You are correct in every detail.
Still, a case of sorts can be made that after the House Divided speech Lincoln was determined, if elected president, to find a way to take up arms to overthrow constitutional slavery - since he didn’t have the votes.
Many, many style it as “Lincoln fought to free the slaves.”
I believe Lincoln did add a slave state to the Union after the Emancipation Proclamation.