confederated
adjective
[ kənˈfɛdəreɪtɪd ]
• (of states or groups of people) joined in or forming an alliance.
• "Switzerland is a model for the new confederated Europe"
confederate
verb
• bring (states or groups of people) into an alliance.
• "the treaty confederated the fourteen tribes"
Origin:
late Middle English: from late (ecclesiastical) Latin confoederatus, from con- ‘together’ + foederatus (see federate).