Assertion: american art movement | /r/CapableOf | gain momentum
Facets:
value: as a reaction against abstract expressionism
type: CAUSE
value: in the late 1960s
type: TEMPORAL
value: in 1970s
type: TEMPORAL
Source sentences:
text: Primarily an American art movement, it gained momentum in the late 1960s and 1970s as a reaction against Abstract Expressionism.