Punctuation question. Capital or non-capital?

Somebody (one word) from a country is described using the adjectival form of the country's name; as a proper noun it is always capitalized.

e.g. America, American; England, English; Australia, Australian or Aussie (slang); New Zealand, New Zealander or Kiwi (slang).

Both American and Aussies should be capitalized, and I think all the other nationalities should be too if it's in the third person.

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Capital. They're proper nouns and thus should be capitalized.

i am pretty sure it is the Aussie's. because you are substituting this for their names which would be capitalized. they are pronouns