Assertion: mound's building | /r/CapableOf | start in america
Facets:
value: at an early date
type: TEMPORAL
Source sentences:
text: In the Americas, building of complex earthwork mounds started at an early date, well before the pyramids of Egypt were constructed.
text: In the Americas, building of complex earthwork mounds started at an early date, well before the pyramids of Egypt were constructed.