Before 1492, the Portuguese Discovery of America

BEFORE 1492 presents a compelling argument, based upon known historical facts and reasonable scientific deductions, that Portuguese mariners discovered America at least a decade before Columbus set sail on the Santa María, Pinta and Niña.

The primary evidence for this theory is a map, now on permanent display at the U.S. Library of Congress in Washington. The map - - called the Waldseemüller map - - was the first map to use the name 'America' for the newly discovered continent.

Yet, the map d...