Ah, yes. Well, let's just see about that.
Just to choose Texas:
WHEREAS, The recent developments in Federal affairs make it evident that the power of the Federal Government is sought to be made a weapon with which to strike down the interests and property of the people of Texas, and her sister slave-holding States, instead of permitting it to be, as was intended, our shield against outrage and aggression....
(emphasis mine)
Said property, in Texas and in the other "slave-holding States" being, of course, slaves -- as is made abundantly clear in the various declarations of secession.
Stop trying to deny what's true, DM.
“Stop trying to deny what’s true, DM.”
You make a reference to a geographic adjective, and not a cause.
You should read with a little less bias.