Source : WordNet®

federalise
     v 1: put under the control and authority of a federal government
          [syn: {federalize}]
     2: enter into a league for a common purpose; "The republics
        federated to become the Soviet Union" [syn: {federate}, {federalize}]
     3: unite on a federal basis or band together as a league; "The
        country was federated after the civil war" [syn: {federate},
         {federalize}]