The Great Dying - Genocide?

What happened to them, the Aztecs, Incas, Mayans. Ever since I was a child and learned about these three types of South American tribes, I was fascinated with their art, religion, games and civilization. For me, they were in a word of their own. Yes of course, some of their beliefs were barbaric and must have been a little overwhelming to watch, but their infrastructure was amazing for such an underdeveloped society. They had Olympic style games, organized military, sewer and water systems, very ornate jewelry, communication - what a cool little civilization. 

Then came the westerners, who brought conquests, forced religion and disease. Disease that killed large parts of the population because the immune system was not developed in these native Americans. If the conquistadors did not get you then their disease did. I just could not imagine having this wonderful life, living among a well established society that you thought was well protected then - bam! You are hit by the white man and all the troubles that come with him. It is all about time during your life on earth, you just need to be living during the happy times and hope you are not part of the bad times.