The correct answer is to learn more about how the USS Maine was built.
There are different types of ships. If the historian wants to learn more about the architecture of the ship, the reasons it sunk, how it is built, and every room it has, he needs a diagram of the ship.
The USS Maine's sinking is still a subject of debate. Some historians say it's because of an external explosion from a mine, while others say it was an internal explosion in the vessel. A historian may use photographic evidence, naval experts, and archival information, such as diagrams, to determine the cause of the explosion.
