Why did Additonal states secede after the battle of fort Sumter

The second group of southern states seceded after the attack at Fort Sumter. Four additional states left at this time. These states left because they had concerns about what would happen to slavery now that the fighting had begun. They waited until the Civil War began before leaving the Union.

Explanation:

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might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

determination