Assertion: butte | /r/HasProperty | as crucial
Facets:
value: for engines or pittsburgh for steel
type: PURPOSE
value: for pittsburgh
type: TRANSITIVE-OBJECT
value: for the copper
type: TRANSITIVE-OBJECT
Source sentences:
text: During the early years of the century, Butte was a big, noisy cog in our national machinery, greater in population than Houston, Dallas, or Phoenix and as crucial to the economy for the copper it mined as Detroit was for engines or Pittsburgh for steel.