The answer is natural resources.
Answer:
The U.S wanted Mexico's land (AKA California and Arizona and etc..)
Explanation:
He shot himself in the head
The Indian Rebellion of 1857 had diverse political, economic, military, religious and social causes. ... The spark that led to a mutiny in several sepoy companies was the issue of new gunpowder cartridges for the Enfield rifle in February, 1857. A rumour was spread that the cartridges were made from cow and pig fat.