REMEMBEFR THE MAINE
or
SHOULD YOU JUMP TO CONCLUSIONS WITHOUT MUCH EVIDENCE?
(Especially when the decision to go to war might be riding on the conclusion.)
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There are some issues about whether the USS Maine was really sunk by a mine -- Spanish or otherwise -- in Havana Harbor in 1898.  The perception that it was a Spanish mine proved to be a catalyst for war with Spain even if there were other underlying forces pushing the two nations toward war.

Read about the investigation of the Maine disaster at these links:

Naval Historical Center -- Department of the Navy

American Social History Project, CUNY

Admiral H. G. Rickover's Report: How the Battleship Maine Was Destroyed