Which is correct. When in Argentina (some years ago) people referred to themselves as Argentines (with a long "i"). In more recent postings, I've seen them referred to as Argentinians. The phrases, "This is a picture of an Argentine countryside," or "He is an Argentine performer,"--are they passè? I always felt "in the know" by using the same adjective the Argentines used. Now I am afraid I am "out of the loop" by not keeping up with the Argentinian changes!