I came across the Miniature Wargame and thought I should share. Dracula's America: Shadows of the West is a Osprey Games publication. The one sentence summery "It is 1875, and Count Dracula is President of the United States of America." The game pits Dracula's Vampires, Cultist Railroad Tycoons, The United Native American Tribes, The Confederate States that turned to Necromancy, and others.
I did not find anywhere an official RPG setting. This was to cool an idea not to share.
Edit: Only after I wrote the above did I realize how old this game was..... well it was new to me