The merrimack and the monitor changed the naval war because they engaged in the first battle between who

The Union and the Confederacy in the Civil War.

The Merrimack and the Monitor battle is referred to as the Battle of the Ironclads and is considered the most important naval battle of the Civil War and was the first meeting (in combat) if ironclad warships.

the answer to your question is ( syngman rhee) have a great day

hey i did something like that before, what is the quesiton?