The immediate effect of the Confederacy firing on Fort Sumter was caused by the beginning of the Civil War.
B. It caused the beginning of the Civil War.
Step-by-step explanation:
After Beauregard's bombardment in 1861, Confederate forces took over Fort Sumter and used it for arranging defense of Charleston Harbor. Once the defense is ensured, a hole is created in the Atlantic seaboard by Confederates.
Fort Sumter is a sea fort located in the South Carolina. Confederate forces fired shots at the Fort Sumter on April 12, 1861. This led to the beginning of Civil War. Fort Sumter ruined after the Civil War. U.S. Army worked hard to restore and rebuilt the fort.