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Simplified etymology
Confederacy is recorded from late Middle English. It is related to confederate, from Latin confoederatus, meaning “joined together in a league or treaty,” and to federal through Latin foedus, meaning “treaty” or “agreement.” The eleven southern Confederate States were a confederacy from 1860 to 1865.
Etymology
From Middle English confederacie, through Anglo-Norman confederacie, from Latin confoederatio, 'an agreement or league.' The Latin verb confoederare meant 'to unite by treaty,' from con- ('together') + foedus ('treaty, compact'). Confederation is a doublet from the same Latin source.