Premise: North Vietnam , officially the Democratic Republic of Vietnam ( DRV ) , was a state in Southeast Asia which existed from 1945 to 1976 . With the failure to reunify Vietnam by elections , the Democratic Republic of Vietnam attempted to unify the country by force in the Vietnam War ( 1955 -- 75 ) .
Hypothesis: North Vietnam existed from 1945 to 1976.
Label: ENTAILMENT