Full Idea
From early days down to modern times war has been the chief engine in enlarging the size of communities, and fear has increasingly replaced tribal solidarity as a source of social cohesion.
Gist of Idea
Increasingly war expands communities, and unifies them through fear
Source
Bertrand Russell (Authority and the Individual [1949], 1)
Book Reference
Russell,Bertrand: 'Authority and the Individual' [Unwin 1977], p.15
A Reaction
It is a feature of modern nationalism to try to generate fear of various outsiders, even in times of peace. Most of us despise such things, but the underlying desire for greater national unity is not unworthy. What enemies would a world state have?