1. what theories are there about the mayan civilization disappearance?

one by one, the classic cities in the southern lowlands were abandoned, and by a.d. 900, maya civilization in that region had collapsed. the reason for this mysterious decline is unknown, though scholars have developed several competing theories

explanation:

it's lower nubia : ) good luck

"the sepoy rebellion was the result of many, many influences and stressors on the cultures of india living under british rule. in britain, it's called the sepoy mutiny on the indian mutiny, but in india, it's called the first war of independence.

the main reason is concerned to the british paramountcy , the belief in british   dominance in india political, economic and cultural life had been introduced in india about 1820."

"they were forced to grow crops that benefited the colonizing nations instead of feeding their own people."