The Maya Indian Civilization flourished from 250AD to 900AD; this is known as history's Classic Period; there were as many as one-million Maya Indians in Belize.
Between the Classic Period and Post-Classic Period the Maya Empire split into separate conflicting "City States," just like the Roman Empire, lasting until the Spanish Colonial Period in the early 1600's. Though not known why, there are many different reasons this split could have happened, such as, over population, a revolt, disease or drought. However, there is evidence that there was over population.