The primary culprits in transmitting this disease were oriental rat fleas carried on the back of black rats.
The answer is the Cotton gin
The fall of the Mayan civilization is due to the overpopulation, environmental degradation, warfare, shifting trade routes and extended drought.
<h3>How did geography affect the Mayan civilization?</h3>
Unlike the Aztecs or Inca, the Maya were never a unified empire, largely because of geography. The dense, thick jungle was simply too great an obstacle for widespread urbanization. The landscape kept the many Maya cities naturally isolated from each other, so each one maintained an independent identity. The rainforest - home to many Maya cities - made crossing land difficult. Geographic features that make travel difficult are called natural barriers. The land of the Maya had many natural barriers.
So we can conclude that: The fall of the Mayan civilization is due to the overpopulation, environmental degradation, warfare, shifting trade routes and extended drought.
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I believe that the correct answers are 1, 2, 4, and 5. The only incorrect option is 3.
