Which European country was the first to send explorers across the Atlantic Ocean? A. Spain B. England C. France D. Portugal. A. What were the two most important city-states of Ancient Greece? A. Apollo and Zues B. Athens and Sparta C. Doric and Ionic D. Plato and Socrates . B. Jamestown was named for the King of ______. A. Spain B. Africa C. France D. England.