This combination of Federal Law that favored Northern businessmen, Federal law prohibitions against Southern expansion of shipping, the 1860 Republican party plank proposing a federally funded transcontinental railroad, and the Lincoln supported Morril tariff would eventually turn out to be the major causes of the secession. Too bad those guys that wrote Mississippi's secession document didn't know that in 1861. They would have at least mentioned all that and not wasted all that ink only talking about slavery.