[Blue House Sue]

The Declarations of Secession also mention slavey as the primary cause.

[FLT-bird]

Only 4 states issued declarations and only one did not also discuss economics - namely high tariffs to benefit Northern manufacturers and grossly unequal federal government expenditures even though these were NOT unconstitutional while refusal to enforce the fugitive slave clause of the US constitution WAS unconstitutional.

[DiogenesLamp]

Four of them do. There were 11 states that seceded. 7 is larger than 4.