What caused Vladimir Lenin to argue that imperialism was not a policy?

Answer 1

Lenin argued that people should not speak of Imperialism as a policy because the use of the term would imply that imperialism was something that gave capitalism a choice. Thus there was no science to it at all. Lenin argued that imperialism was a natural development that Marx had simply overlooked.

Answer 2

He thought Imperalism is an extension of power to colonize and that ends with suffering of the people under colonialism.