Assertion: steel guitar | /r/CapableOf | gain wide popularity
Facets:
value: in the mainland
type: LOCATION
value: in the early 20th century
type: TEMPORAL
Source sentences:
text: In the early 20th century, the steel guitar and the ukulele gained wide popularity in the mainland, but the slack-key style remained a folk tradition of family entertainment for Hawaiians until about 1960s and 1970s during the second Hawaiian renaissance.