Why did Mayan civilization disappear?

I hope I can help you. There may be the following reasons:

1 political marriage, the royal brothers are excluded, and other members compete for inheritance and property, resulting in higher-level confusion.

2 the rise of secular culture, the impact on traditional civilization

The Spanish invaders plundered and oppressed, and religious coercion brought disaster to the people.

4 population expansion, infectious diseases

5. Space migration, abandoning the city and returning to the original is the need to transform the new original ecological planet, or it is difficult to travel long distances; Distance requires the quantity and quality of people, and the chaos left behind leads to disaster. The tool is to use the gravity of Halley's comet. The reasons for the disappearance of Mayan civilization are controversial. Most people believe that the earthquake and hurricane at that time, together with population explosion, food shortage, peasant riots and alien invasion, caused the decline and decline of Mayan civilization. However, the exact answer has not yet appeared. The solution of this secret is like a jigsaw puzzle, but it has just begun.