<Tr> <Td> Classic Maya collapse </Td> </Tr> <Tr> <Th> Spanish conquest of the Maya </Th> </Tr> <Tr> <Td> <Ul> <Li> Yucatán </Li> <Li> Chiapas </Li> <Li> Guatemala </Li> <Li> Petén </Li> </Ul> </Td> </Tr> <Ul> <Li> Yucatán </Li> <Li> Chiapas </Li> <Li> Guatemala </Li> <Li> Petén </Li> </Ul>

How did the mayans come up with their calendar