The Mayans were in Central America, for about 1,200 years. They peaked around the 6th Century C.E. The Mayan's biggest population was 2,000,000 people! They worked hard for food, and that is how their population grew!
The 365 Day Calendar helped the Mayans know when to start harvesting and cropping their food. The food was very important because the population grew by that. They used "slash-and-burn" agriculture.
How Did the Mayans Come to an End?
Rubber was important for the Mayans because they would dip their feet into the rubber and let it cool. Then, the rubber would make shoes for them, so their feet wouldn't hurt when they walked on the road, and dirt!
What Was the Right Theory?
The roads were important because it would be an easier route and they would have to go over and under obstacles, like trees, rivers, and rocks. It would help the people go and come back to places quicker.
The Mayan Civilization came to an end by environmental change and natural disaster. There were many theories but some of them were environmental change and natural disasters, diseases, famine, and war. The theory that was wrong was Yellow Fever. Yellow Fever was a diseases that came from monkeys. It didn't come to them until 1500's but the civilization was already falling in 800C.E.
The right theory was the environmental change and natural disasters. The Mayans used "slash-and-burn" so they would catch the crops on fire and the dirt would have to sustain for 3 to five years. Then, it would have to fallow for another ten years. That means that the land was less fertile. Then, if there was less food, that means that there was war, and the population was going down since there was no food, and people were dying.