Last of the USA's "lower 48” states to gain statehood (7)

I believe the answer is:

arizona

(Other definitions for arizona that I've seen before include "State of SW USA" , "State of south-western US" , "State of southwest USA" , "State represented by Senators Barry Goldwater and John McCain" , "US state containing the Grand Canyon" .)

I've seen this clue in The Times.

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