William Walker

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So read the part under "Influence and Reputation", specifically, the part about how he got his butt kicked in Costa Rica in 1856. This is a source of great national pride in CR.

http://en.wikipedia.org/wiki/William_Walker_%28soldier%29

He began his campaign on this day in 1855. The US tried to convert Central America into a "slave holding empire".

(P.S. I love Wikipedia)