Question

55. South Carolina was the first state to leave the
Union, which is called

Answer 1

South Carolina's secession from the Union started the American Civil War.

Step-by-step explanation:

South Carolina was the first state to leave the Union, which is called secession. Secession refers to the act of withdrawing from a political group or organization. In the case of South Carolina, this event marked the beginning of the American Civil War.

Learn more about secession