What happened to the myans in 900 CE?

Around 900 CE, many Maya city-states in the southern lowlands experienced a significant decline, often attributed to a combination of factors such as prolonged drought, environmental degradation, warfare, and social upheaval. This decline led to the abandonment of major cities like Tikal and Calakmul, and a shift in population towards the northern regions, including the Yucatán Peninsula. Despite this decline, the Maya civilization did not disappear; rather, it transformed, continuing to thrive in different areas and eventually developing new centers like Chichen Itza.