No occurrences in the other 10 states
How did I know I’d get a reply from you? Here’s the truth: although not every southerner fought for slavery , the plain fact remains the south seceded from the union because it feared Lincoln or people in his party would end slavery. Despite the fact that Lincoln tried to reassure the southern states that he wouldn’t change anything. All other arguments for the south seceding are spurious.
Uh, du-uh. Some of those are just ordinances announcing a dissolution of ties to the United States. They don't give reasons of any sort.
If you look at the declarations of the causes of secession from some of the states, slavery is quite prominent. Link
And this is surprising in a way. Southerners convinced themselves that secession was right because they saw the North "enslaving" them, so one would expect them to avoid using the word "slave." That they didn't is a sign that slavery was an unavoidable reason for secession.