Which continent's countries run alphabetically from Argentina to Venezuela?

Alpha Centauri lies about 4.4 of which units away from us? Which magazine did John H. Johnson found in 1951, six years after he founded Ebony? Listed alphabetically by first name, which U.S. president comes last? Listed alphabetically by last name, which U.S. president comes last? Alphabetically, which of Snow White's seven dwarfs comes first? Listed alphabetically by last name, which U.S. vice president comes first? Alphabetically, which noble gas comes last? Alphabetically, which planet in our solar system comes last?