Answer: 3) a new type of warship with sides covered into iron.
Explanation:
Ironclads were a crucial innovation in the history of naval warfare. The term was known for iron-armored wooden hulls. Warships used by the The Confederacy since the year of 1861 were to combat the numerically superior Union navy. Union ironclads were also associated with North Carolina. The USS Monitor sank off Cape Hatteras on 31 Dec. 1862.
Europe got tired of Africa, so they split it up according to resources
The US were splitting? The Declaration of Independence