European aggressor nation

During the Progressive Era, a period of significant social activism and institutional reform from the 1890s through the 1920s, political actors in the United States adopted four constitutional amendments in a short span of roughly 10 years: the Sixteenth Amendment, authorizing a direct income tax

Explanation:

"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."