The Mayans lived in Central America around 250 C.E.
The Mayans used "Slash and Burn"
They used painkillers
They dominated Central America for 1,200 years. Their civilization went from Southeastern Mexico to modern-day Guatemala, Belize, Western parts of Honduras and El Salvador.
They made a 365 day calendar
The Mayans used "Slash and Burn." What they did was when a crop is done growing they cut the crop to a stump and, they burn the rest of the crops and the ashes gave the soil nutrients. But they could only do this a couple times before the soil could not grow plants anymore.
All of the theories of the Mayan civilization coming to an end are warfare, Disease, Famine, and Disaster or Environmental change.
The painkillers were a combination of mind, body, religion, ritual ,and science. It was only practiced by a select few who generally get extensive education.
I most likely think that Warfare made the Mayan civilization come to an end.
The calendar was a 365 day calendar. The Mayans thought that after 360 days of the year were over that they had 5 days that the gods didn't protect them and that there were 13 joints that spirits could enter their body.
One reason I think that disproves Famine is that they put their civilization in danger. Because they could have just moved to another farming field and farmed.
I think warfare caused the Mayan civilization to some to an end because the tribal leader probably took his tribe into a war that they could not win.