#free_state  any state prohibiting slavery prior to the Civil War
  exclusion:  slave_state
  supertype:  American_state  one of the 50 states of the United States
  part of:  Union__North  the United States (especially the northern states during the American Civil War); "he has visited every state in the Union"; "Lee hoped to detach Maryland from the Union"; "the North's superior resources turned the scale"

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