Leif Erikson
Leif Erikson or Leif Ericson ( 970 – c. 1020) was a Norse explorer from Iceland. He was the first known European to have set foot on continental North America (excluding Greenland), before Christopher Columbus. According to the Sagas of Icelanders, he established a Norse settlement at Vinland, tentatively identified with the Norse L'Anse aux Meadows on the northern tip of Newfoundland in modern-day Canada. Later archaeological evidence suggests that Vinland may have been the areas around the Gulf of St. Lawrence and that the L'Anse aux Meadows site was a ship repair station.
Christopher Columbus
The scholar Amerigo Vespucci, who sailed to America in the years following Columbus's first voyage, was the first to speculate that the land was not part of Asia but in fact constituted some wholly new continent previously unknown to Eurasians. His travel journals, published 1502–04, convinced German cartographer Martin Waldseemüller to reach the same conclusion, and in 1507—a year after Columbus's death—Waldseemüller published a world map calling the new continent "America" from Vespucci's Latinized name "Americus". According to Paul Lunde, "The preoccupation of European courts with the rise of the Ottoman Turks in the East partly explains their relative lack of interest in Columbus's discoveries in the West."