The main factor was the utilization of raised field agriculture. They would build these fields that had been artificially raised to a certain height along a flowing water source (mostly rivers but occasionally streams as well in some cases). When tropical weather patterns would cause said water sources to flood, instead of washing away the crops, it would act as irrigation for the raised fields. Securing a steady food source allowed the Mayans to support a large civilization in the tropical regions they called home.
Answer:
magic word "should" but don't have to.
Answer:
a plan, unsuccessfully proposed at the Constitutional Convention, providing for a single legislative house with equal representation for each state.
German tourist had discovered Otzi The Iceman on September 19th, 1991, while hiking in the Alps.
