Answer: The Indian Removal Act
The law authorized the president to negotiate with southern Native American tribes for their removal to federal territory.
Here are some major changes that was introduced by the British after the revolt of 1857:
The Queen of Great Britain ruled India directly. In the past, it was done by the East India Company.
The Hindu-Muslim unity in the war surprised and made the British afraid. From there, they started the open policy of “Divide and Rule”.
The British left the social practices of Indians alone since interference in cultural and social issues of Indians was one of the reasons why a war took place.
The best and most correct answer among the choices provided by the question is the fourth choice "Imperialism"
Imperialism, in a broad sense, is a political theory where a country (usually an empire or kingdom) extends its power by acquisition of territories. It may also include the exploitation of those territories which is similar to colonialism which is generally regarded as an expression ofimperialism<span>.</span>
I hope my answer has come to your help. God bless and have a nice day ahead!