Question

which environmental event most likely contributed to the end of the Ancestral Puebloan and Mississippian cultures?

Answer 1

The event that most likely contributed to the end is a 300-year drought called the Great Drought.

Answer 2

The answer is C.

As a science website says, "Scientists think they know why the Ancestral Puebloans disappeared. The primary culprit, studies suggest, was a megadrought that would have made it impossible to grow enough food to feed the tens of thousands of people living in the region."

If you didn't know, drought represents the lack of rain.