In "Pure Sociology: A Treatise on the Origin and Spontaneous Development of Society" (1903) Ward theorizes that throughout human history conflict and war has been the force that is most responsible for human progress.
A Treatise on the Origin and Spontaneous Development of Society“ z roku 1903 Ward říká, že konflikt a válka jsou síly, které jsou nejvíce zodpovědné za pokrok lidstva.