No, it is not. South America is a proper noun and South American is a proper adjective. There is no adverb form used for most place names.
The Battle of Bunker Hill was the first major battle OF THE AMERICAN REVOLUTION an adverb phrase!
adjective phrase
An adverb phrase is two or more words that act as an adverb. It would be modified by an adverb or another adverb phrase.
Adverb Phrase
adverb phrase
No. But the prepositional phrase "in it" is an adverb phrase.
adverb
An adverb phrase is two or more words that act as an adverb. It would be modified by an adverb or another adverb phrase.
The phrase "of the American Revolution" will virtually always be an adjective phrase, following nouns such as "the start" or "the decisive point" or "an important battle." The preposition "of" does not typically form adverbial phrases.
It is an adverb phrase (tells where).
adverb phrase
It is a prepositional phrase functioning as an adverb. Hint: A word or phrase that answers the question 'Where?' is functioning as an adverb (I think).