What event caused four additional Southern states to secede from the Union?

(1 point)
Responses

The U.S. accepted West Virginia as a state.
The U.S. accepted West Virginia as a state.
The South fired on Fort Sumter.
The South fired on Fort Sumter.
Lincoln declared the Emancipation Proclamation.
Lincoln declared the Emancipation Proclamation.
Lincoln raised an army.

The event that caused four additional Southern states to secede from the Union was Lincoln raised an army.