Answer:
The Additional states sucede after the battle of fort summer because they have fears that slavery will stop in there states and it will distrup the business or affects the Economies of there states negatively
Step-by-step explanation:
When Abraham Lincoln was elected into the office of the president, some states in the south fears that he might end slavely, so they sucede but not all of the southern states suceded, about four states in the south still remain in the United States of America which was popular called back then as the UNION .This four states taught the President will not end slavely at first but after the battle of fort Summer, they realize that the slavely will be abolished. So they join the first group of seven states that earlier declared Independence from the UNION