Assertion: biological warfare's use | /r/HasProperty | the united states
Facets:
Source sentences:
text: The only country to have used a nuclear weapon in war is the United States, which dropped two atomic bombs on the Japanese cities of Hiroshima and Nagasaki during World War II.
text: On the other hand, the use of war as an instrument of policy was calculated in an unprecedented manner by the nuclear superpowers, the United States and the Soviet Union.