Who really discovered America and what happened on October 12, 1492

Through the works of Miguel León-Portilla, Edmundo O'Gorman, and Federico Navarrete we can glimpse historiographic paradigms that differ from Eurocentrism, what happened on October 12, 1492: the discovery of America?

Who really discovered America and what happened on October 12, 1492
Exploitation of Mexico by the Spanish conquistadors by Diego Rivera.