Crossword Genius

What was once due to American pioneers? (4)

Ross

I believe the answer is:

west

(Other definitions for west that I've seen before include "English county" , "Dog (from Argyll?)" , "Occident" , "Mae -, US actress; W" , "The cardinal compass point of 270 degrees" .)

I've seen this clue in The New York Times.
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