Which of these countries borders Argentina?

Which of these was one of the four original provinces of Canada at Confederation in 1867? In the complete metamorphosis of most insects, which stage comes between the larva and the adult? Which of these U.S. states is officially called a commonwealth? In 1903, which of these cities had both a National League and an American League team? Which automaker joined General Motors and Ford as Detroit's "Big Three"? In 1990, the U.S. Postal Service issued stamps honoring four classic films from 1939. Which of these was one of them? Which man lost the 1796 presidential race to John Adams but beat Aaron Burr in 1800? Native American men including Iron Tail posed for the portrait on which U.S. coin first minted in 1913?