Assertion: american football | /r/HasAspect | professional leagues
Facets:
value: for over 100 years
type: TEMPORAL
value: continuously
type: TEMPORAL
Source sentences:
text: Baseball, American football, and ice hockey have had professional leagues continuously for over 100 years; early leagues such as the National Association, Ohio League, and National Hockey Association formed the basis of the modern MLB, NFL, and NHL, respectively.