Final answer:
The decline of the Mayan civilization was not speculated to be due to trade stopping between city-states. Other factors such as soil depletion, constant wars, and overpopulation contributed to their decline.
Step-by-step explanation:
The Mayan civilization experienced a decline due to various factors. However, trade stopped between city-states was NOT speculated as being a reason for their decline. The Mayans had an extensive trade network and exchanged goods such as obsidian, jade, salt, and textiles. Other reasons for the decline include soil depletion caused by intensive farming practices, constant war among city-states, and overpopulation which led to strain on resources and food shortages.
Learn more about Decline of the Mayan civilization