Abraham Lincoln: Vampire Hunter - http://www.imdb.com/title/tt1611224/
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Lincoln's election triggers the secession of the southern states and the start of the American Civil War. Early battles, such as the First Battle of Bull Run go poorly for the Union troops after they are attacked by Confederate vampires. Lincoln decides that the best way to defeat the vampires is to eliminate their food source and starve them out — to that end, he announces the Emancipation Proclamation and encourages the slaves to fight back against slave owners and vampires alike. This begins to turn the tide of the war.
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