If you are looking for an interesting book of ideas in that part of the world, you may want to take a look at some sections in the Book of Mormon. All religious questions aside (please, or PM me), it contains a history of two groups of people -- the Nephites and the Lamanites -- in that part of the world. Great game ideas including huge wars and political manuvering eventually leading to the downfall of the Nephite nation.
It is divided into books, but the last half of the book of Alma, the first half of the book of Heleman, the book of Ether, the book of Mormon (he was the compiler of the records that went into the Book of Mormon) all contain some great ideas for campaigns.