Assertion: bison's population | /r/CapableOf | collapse in north america
Facets:
value: around the last glacial maximum
type: TEMPORAL
value: dramatically
type: MANNER
Source sentences:
text: Our aim was to study the impacts of climate change on animal populations, and sure enough we quickly found that in North America, populations of bison collapsed dramatically around the Last Glacial Maximum (between about 18,000 and 21,000 years ago).