In a federal manner.

Act of joining together into a single political entity. / Array of nations or states that are unified under one central authority which is elected by its members.

(Australia) Of an architectural style popular around the time of federation.

A surname from German, equivalent to English Feather.

Pertaining to a league or treaty; derived from an agreement or covenant between parties, especially between nations.

(US) A law-enforcement official of the FBI / (historical) A unionist soldier in the American Civil War. / A supporter of federation.

A system of national government in which power is divided between a central authority and a number of regions with delimited self-governing authority.

The unification of states to form a federal union. / The assumption of control or authority by a federal government.

simple past tense and past participle of federate

United, as a federation, under a central government / (computing, telecommunications) Interconnected, as a federation or supernetwork of independent and interoperable services.