Assertion: region's area | /r/HasProperty | explored by william clark
Facets:
value: by fur traders
type: OTHER
value: by various trappers
type: OTHER
value: in 1804–06
type: TEMPORAL
Source sentences:
text: The area had been explored by Meriwether Lewis and William Clark in 1804–06 and by various trappers and fur traders, and settlers began arriving there by way of the Oregon Trail in the 1840s.