Assertion: borough's number | /r/HasProperty | incorporated in year
Facets:
value: since the mandatory borough act
type: TEMPORAL
Source sentences:
text: A number of organized boroughs have been incorporated in the years since the Mandatory Borough Act, but most (the primary examples being the North Slope Borough, the Northwest Arctic Borough and the Denali Borough), were incorporated to exploit a source of significant taxation potential, including natural resource extraction and tourism.