I want to know the answer to the following question:
What event in 850 AD coincided with the collapse of Mayan civilization?
All the background I'm provided with is that "According to George Raudzens, "It is clear that in pre-Columbian times some groups struggled to survive and often suffered food shortages and famines, while others enjoyed a varied and substantial diet."". Is that enough to answer the question?
Answer: no