First, at least the laws of arithmetic have not yet been rejected by the politically correct. Thus, Cortes and the conquistadors battled the Aztec empire from 1519-1521. However, the events to be described in South America happened in 1450. Columbus only reached the Americas in 1492, so there was no chance that white racism caused this, or is there???
https://www.naturalnews.com/2019-07-20-mass-grave-discovered-in-peru-children-animal-sacrifice.html
https://www.dailymail.co.uk/sciencetech/article-6778541/Worlds-largest-mass-sacrifice-discovered-South-America-140-children-slaughtered.html
“The slaughter of hundreds of young children and llamas in 15th century Peru may have been in response to a huge El Nino. More than 140 boys and girls aged between five and 14 were slaughtered in what is thought to be a mass sacrifice to appease the gods of a now extinct religion. Many of the children and juvenile animals had their hearts cut out during the grisly ritual. It is thought a huge El Niño caused major flooding and storms which triggered the bloody sacrifice. Analysis of the remains of more than 200 juvenile llamas and humans dates it to approximately 1450, during the peak of the Chimu civilisation in northern coastal Peru. The Huanchaquito-Las Llamas burial site is a 7,500 square foot area located less than half a mile from the Chimu's capital Chan Chan, a UNESCO World Heritage site.