Why couldn't the colonization of America be peaceful between the Spanish and the indigenous?

just greed ! greed is the key yes but there is a special word for the process its called imilation. they knew exactly what they where doing. .they used biological war fair on them cuz there numbers where to great to just move in they gave us guns to use against our rivals. they took our religion and beliefs and buried them under history.they killed all who would not unlearn there way of life. natives believe in serenity westerners believe in possession.