Keegan, F. William. "One New World, Many Claimants." Vista Magazine, Sept. 8, 1991. (Accessed August 2, 2011.)

Smithsonian National Museum of Natural History. Vikings: The North Atlantic Saga. (Accessed August 2, 2011.)

Columbus Day: Stories of Exploration


Columbus Day memorializes the story of Christopher Columbus's 1492 landing in the present-day Bahamas. Some, however, claim that explorers from other continents reached the Americas years earlier.

Arrange these groups from earliest to latest, placing at the top the group claimed to have reached the Americas first and at the bottom, the group that claims the latest date.