Sotheyhadtopracticeslashandburnagriculturewheretheyslashdownvegetationandthenburnittoinfusethesoilwithenoughnutrientstosustaincropsfor a fewyears, beforemovingontoanotherplotoflandandlettingtheoldforestrygrow.
It's a minormiraclethattheMayawereabletobuildthekindsofsettlementstheydidwithsuchinhospitableland.
SowhiletheMayaspentthecenturiesbetween 250 and 900 ADtryingnottodieofhungerandthirston a regularbasis, theywerepracticingtheirreligionwhichisreallyinterestinginhowheavilycyclicalitis.
TheMayaalsothoughtthatnobeginningorendwasdefinite, andthatwhensomeonedied, theywenton a journeythroughtheunderworldandtheheavensbeforeshowingbackuponearth.
Ifmountainouscitiesweren't crazyenoughontheirown, theIncaalsohad a networkofhundredsofsuspensionbridgesmadeonlyfromwovenfibersthatranallacrossthemountains.
Inthecenturiesafter, SpainwouldimporttonsupontonsofgoldandsilverfromtheNewWorldandabsolutelydestroytheireconomywithinflation, sendingthemon a lovelyone-wayridetogeopoliticalirrelevancewithin a century.