"The endeavor of scientific research to see events in their more general connection in order to determine their laws, is a legitimate and useful occupation. Any protest against such efforts, in the name of freefom from restrictive conditions, would be fruitless if science did not naïvely identify the abstractions called rules and laws with the actually efficacious forces, and confuse the probability that B will follow A with the actual effort make B follow A."

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Amid the welter of vague political abstractions ... where meanings shift so quickly and so subtly, not only following changes of thought, but often manipulated artificially by political practitioners so as to obscure, expand, or distort ... a certain broad consistency in its relations to other kindred terms is the nearest approach to definition which such a term as Imperialism admits. Nationalism, internationalism, colonialism, its three closest congeners, are equally elusive, equally shifty, and the changeful overlapping of all four demands the closest vigilance.

— J. Allan Hobson