Assertion: frigate's speed | /r/CapableOf | become in the california gold trade
Facets:
value: in the mid-19th century
type: TEMPORAL
Source sentences:
text: In the United States, where speed became a premium in the China trade and the California gold trade in the mid-19th century, the schooner design was married to that of the old full-rigged, three-masted merchantman, resulting in the famous clipper ships.