oct 31, 1491 - In this stage emergence a growing in the economy with a comercialization
of gold and silver, people were verytalented
with astronomy and development of mathematical system and
as if that were not enough the Spaniards arrives in America in 1492
and find a continent inhabited long ago by different
civilizations. The three most outstanding cultures
at this time (postclassic period)
are the Mayas, Aztecs and Incas.