The Olmec were the earliest people to settle in Mesoamerica. They were an advanced people who established trade connections with neighboring empires such as the Maya v. They thrived from 1500 BC to 800 BC. However, the reasons for their decline are
unclear

There isn't a certain reason but scientist speculate it was environmental change and the people were cut off from food supply.

the ss was the main organization responsible for the genocidal murder of around six million people of european ethnic minorities, essentially jews, in the holocaust. the members of all its branches committed war crimes and crimes against humanity during the second world war (1939-1945). likewise, the ss were involved in commercial enterprises and exploited the inmates of the concentration camps as slave laborers.

the tortures and assassinations committed by the ss were the result of an ideology developed long before the armed conflict, this ideology was based on the racial supremacy of the germans over the rest.