Conversation so far:
who was the strategic thinker and naval war college professor who developed the theory of sea power
Alfred Thayer Mahan was a United States naval officer and historian who developed the theory of Sea Power.
where was Alfred Thayer Mahan born
Alfred Thayer Mahan was born September 27, 1840.

Question: when did the historian die
Self-contained rewrite: when did Alfred Thayer Mahan die