[T]he instinct for control of land, drives back to the earliest times when a wide range of land was necessary for a food supply for men or cattle, an… - John Atkinson Hobson

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[T]he instinct for control of land, drives back to the earliest times when a wide range of land was necessary for a food supply for men or cattle, and is linked on to the "trek" habit, which survives more powerfully than is commonly supposed in civilised peoples. ... The animal lust of struggle, once a necessity, survives in the blood.