No.
South America is a proper noun due to it being the name of a place.
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South American is the proper adjective meaning from South America. For instance, South American vaqueros have a lot in common with North American cowboys.
America is a noun, not an adjective.
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.
Large and varied are both adjectives. South would be an adjective if it were not part of a proper noun. Amazon is likely a noun adjunct here, but Amazonian would be a proper adjective.
The proper adjective for Inca is Incan. An example sentence: They traveled to South America to tour the Incan ruins. In Spanish, the proper adjective is Incaico, as in Imperio Incaico (Inca Empire)
The adjective form of "south" is "southern."
It is difficult to understand the question. "South" is an adjective.
South African
South America
Yes, "Native American" is a proper adjective for indigenous peoples of America.