Answer: federate

AnswerCrossword Clue
FEDERATEUnite, in a way
FEDERATEForm a league.
FEDERATEUnite
FEDERATEJoin forces
FEDERATEJoin states
FEDERATEUnite into a league
FEDERATEForm a league
FEDERATEForm into a league or union
federateForm (states or organizations) into such a centralized unit
federate(of a number of states or organizations) Form a single centralized unit, within which each keeps some internal autonomy
federateto unite in an alliance