Anglophone academic studies often base their theories regarding imperialism on the British experience of Empire. The term "imperialism" was originally introduced into English in its present sense in the late 1870s by opponents of the allegedly aggressive and ostentatious imperial policies of British Prime Minister Benjamin Disraeli. Supporters of "imperialism" such as Joseph Chamberlain quickly appropriated the concept. For some, imperialism designated a policy of idealism and philanthropy; others alleged that it was characterized by political self-interest, and a growing number associated it with capitalist greed.