during the 19th century, there were several ideas among Europeans that legitimized imperialism. Those ideas were, for example, nationalism, racism, and social Darwinism. What were those ideas and how could they legitimize imperialism?

Imperialism had consequences that affected the colonial nations, Europe, and the world. It also led to increased competition among nations and to conflicts that would disrupt world peace in 1914. ... In the first half of the nineteenth century, colonialism became less popular.

Explanation:

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"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."