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简介：NationalGeographicembarksonanexpeditionintothemysteriousworldofancientAmericanhistorytoshedadifferentlightonthehistoryoftheAmericas. Historybookstraditionallydepictthepre-ColumbusAmericasasapristinewildernesswheresmallnativevillageslivedinharmonywithnature.Butscientificevidencetellsaverydifferentstory:WhenColumbussteppedashorein1492,millionsofpeoplewerealreadylivingthere.Americawasn'texactlya"NewWorld,"butaveryoldonewhoseinhabitantshadbuiltavastinfrastructureofcities,orchards,canalsandcauseways.ButafterColumbussetfootintheAmericas,anendlesswaveofexplorers,conquistadorsandsettlersarrived,andwitheachoftheirshipscameaNoah'sArkofplants,animals—anddisease.Inthefirst100yearsofcontact,entirecivilizationswerewipedoutandthelandscapewaschangedforever.…