Answer:
Where did the sinking take place?
Explanation:
The USS Maine was a US Navy boat that sunk on 15 February, 1898, in the Havana Harbor on the shores of then Spanish Cuba. The sinking was caused by an explosion, and with the American press blaming the Spanish, it was a major cause behind the Spanish-American War (April 21 - August 13, 1898).
How many people are in the photograph or who took it doesn't particularly help a historian to investigate what happened. Why did the US Navy use this kind of ship is a question better left to someone interested in military hardware. A historian would ask where did the sinking take place, because knowing where it happened would beg the question of why was that ship there, and who sent it there. Answering these questions allows the historian to reconstruct the timeline of events, and understand the cause-effect behind them.
