Assertion: national park's area | /r/CapableOf | remain undeveloped
Facets:
value: until the 1960s
type: TEMPORAL
Source sentences:
text: The area remained undeveloped until the 1960s, when a series of proposals were made to develop the keys in the manner of Miami Beach, and to construct a deepwater seaport for bulk cargo, along with refinery and petrochemical facilities on the mainland shore of Biscayne Bay.