verb (v)

• unite on a federal basis or band together as a league(verb.change)

  Synonym:
  federalise, federate
  

  source: wordnet30
• put under the control and authority of a federal government(verb.change)

  Synonym:
  federalise
  

  source: wordnet30
• enter into a league for a common purpose(verb.change)

  source: wordnet30
• To unite in compact, as different States; to confederate for political purposes; to unite by or under the Federal Constitution.(verb)

  source: webster1913