Crossword Genius

Oil in USA distributed by American state there (9)

Ross

I believe the answer is:

louisiana

I'm a little stuck... Click here to teach me more about this clue!

'state there' is the definition.
'louisiana' can be an answer for 'state' (I've seen this before). I am unsure of the 'there' bit.

'oil in usa distributed by american' is the wordplay.
'distributed' indicates anagramming the letters.
'by' is a charade indicator (letters next to each other).
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'oil'+'in'+'usa'='oilinusa'
'oilinusa' anagrammed gives 'louisian'.
'louisian'+'a'='LOUISIANA'

Can you help me to learn more?

(Other definitions for louisiana that I've seen before include "American state, capital Baton Rouge" , "IOU a snail over in the US state" , "that's near Mississippi" , "Southern United State on the Gulf of Mexico" , "State named for French king" .)

I've seen this clue in The Independent.
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