S: (n) Creek Confederacy (a North American Indian confederacy organized by the Muskogee that dominated the southeastern part of the United States before being removed to Oklahoma)
S: (n) Hanseatic League (a commercial and defensive confederation of free cities in northern Germany and surrounding areas; formed in 1241 and most influential in the 14th century when it included over 100 towns and functioned as an independent political power; the last official assembly was held in 1669)
W: (v) federate [Related to: federation] (unite on a federal basis or band together as a league) "The country was federated after the civil war"
S: (n) federation (the act of constituting a political unity out of a number of separate states or colonies or provinces so that each member retains the management of its internal affairs)