federated

(verb) enter into a league for a common purpose. Synonyms: federate, federalize, federalise. Example: "The republics federated to become the soviet union."

(verb) unite on a federal basis or band together as a league. Synonyms: federate, federalize, federalise. Example: "The country was federated after the civil war."

(adj) united under a central government. Synonyms: federate.