I think in all of the different books/opinions/blogs/other media I have seen/read the following most fits the bill of what happened during that time period.
the rhetoric of disunion proved pervasive--and volatile.
This is not to say your book doesn't have merit but I really would like to see at least one person go beyond the slave question and look into the total picture of the North versus South power struggle (1789 - 1860) that lead up to this conflict. It was not all one sided and slavery, as such, doesn't even enter into it until about 1820 or so when "Uncle Toms Cabin" was published.
Have you read this book yet, ironfoot? If so what is your impression of it?
You know, of course, that secession first came up during the Hartford convention and was brought about because the North (Mass.) thought that the South had to much power and they had not enough.