Assertion: black minstrel show | /r/CapableOf | proliferate in the 1860s
Facets:
Source sentences:
text: When all-black minstrel shows began to proliferate in the 1860s, they often were billed as "authentic" and "the real thing".
text: When all-black minstrel shows began to proliferate in the 1860s, they often were billed as "authentic" and "the real thing".