Question

why do historians call the modern period in indian a period of colonial rule

Answer 1

hey ,
during the modern period in india the colonial rule was established in our union territory by the british in 1858 and Queen Vitoria was proclaimed as Emperess of India 

Answer 2

The historians call the modern period in Indian history a period of colonial rule because it was under the foreign occupation since 1757 to 1947. The British had turned India into a colony. We see there was an economic exploitation and unilateral drain of wealth from colony (India) to Metropole (Britain).

The British used the resources and raw material of the colony ( India ) for the development of Britain and its people.