He Discovered in Sense of It was the other WORLD at that time - No one was aware of other people in World and Countries etc --- Columbus discovered them and Connected them With Us So that Americans Kill their Money on Wars by Killing people in countries like Afghanistan , IRAQ etc etc etc
The rest of the world Europe/asia disn't knew about that continent ... that's why is simple logical stuff ...
Look at these are: http://en.wikipedia.org/wiki/Piri_Reis_map http://www.world-mysteries.com/sar_1.htm http://images.google.com/images?hl=...q=piri reis map&lr=&um=1&ie=UTF-8&sa=N&tab=wi