The Plains Indian Wars Map board centers on the Great American Plains between the Mississippi River in the east and the Rockies in the west, the Canadian border in the north and Mexican border in the south. The Northern and Southern Enemies are each defending 5 purple regions, The NPT and SPT are defending 12 regions each. Separating the NPT and SPT is the planned route for the Transcontinental Railroad. US Completion (linking the two lines) ends the game and earns the US player a bonus. The Indian player earns a bonus if this is prevented.