The bolded word "of Arizona" is regarded as a noun phrase.
A nouns phrase refers to a string of words that contain a noun but does not make a complete meaning. In this case, the noun is found to function in the sentence as a prepositional object.
We know that there are eight parts of speech in the English language and the noun is part of the eight parts of speech which add meaning to a sentence that we make.
Thus, the bolded word "of Arizona" is regarded as a noun phrase.
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