Assertion: border collie's dog | /r/HasProperty | imported to the united states
Facets:
value: first as sheepherders
type: MANNER
value: as participants in herding competitions
type: MANNER
value: since the nation’s birth
type: TEMPORAL
Source sentences:
text: Dogs resembling Border Collies were reportedly being imported to the United States since the nation’s birth, first as sheepherders, then as participants in herding competitions.