Assertion: potato | /r/CapableOf | make critical difference
Facets:
value: in world history
type: TEMPORAL
value: in south america
type: LOCATION
Source sentences:
text: The historian William H. McNeill (1999) believes that potatoes twice made a critical difference in world history: first, in South America, where the vegetable provided the principal energy source for the Inca and their Spanish successors.