Which statement best decribes the domino theory

Do you have a answer list to pick from?But the domino theory can be summed up just as the name says. For something to follow another thing with the same act and the cycle goes on just like domino's.

South carolina was so angry about the election of lincoln that they seceded from the union on december 20, 1860. they attacked fort sumter later, on april 12, 1861.