[28] Imperialism can be broadly defined as the complex of intentions and material forces which predispose states to an incursion, or attemted incursions, into the sovereignty of other states. General historical works abour empires are etiolated and bloodless without the concept of imperialism.... Nor does the passive, naturalistic term 'expansion' fill the bill; the word gives no hint of the ruthless drive for dominance in the overseas world which periodically seized metropolitan statesmen, missionaries, soldiers and sailors.