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Antifederal party

American  
[an-tee-fed-er-uhl, -fed-ruhl, an-tahy-] / ˌæn tiˈfɛd ər əl, -ˈfɛd rəl, ˌæn taɪ- /

noun

U.S. History.
  1. the party that, before 1789, opposed the adoption of the proposed Constitution and after that favored its strict construction.