Premise: Franklin D. Roosevelt . As an active military leader , Roosevelt implemented a war strategy on two fronts that ended in the defeat of the Axis Powers , and he initiated the development of the world 's first atomic bomb . A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions , either fission ( fission bomb ) or a combination of fission and fusion ( thermonuclear weapon ) .
Hypothesis: Franklin D. Roosevelt started the development of a nuclear weapon.
Label: ENTAILMENT