Assertion: american bison's number | /r/CapableOf | suffer their most severe collapse
Facets:
value: in the past
type: TEMPORAL
Source sentences:
text: In the past, numbers of African buffaloes suffered their most severe collapse during the great rinderpest epidemic of the 1890s, which, coupled with pleuro-pneumonia, caused mortalities as high as 95% among livestock and wild ungulates.