Enter into a league for a common purpose:
— The republics federated to become the Soviet Union.
Unite on a federal basis or band together as a league:
— The country was federated after the civil war.
United under a central government.
Moby thesaurus: act in concert, act together, affiliate, ally, amalgamate, associate, band, band together, be in cahoots, be in league, bunch, bunch up, cabal, cement a union, centralize, club, club together, coact, coalesce, collaborate ... show more.
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