Division can refer forming a whole into parts (see Division (math)) which has analogies to politics and the military.
Liberals like to complain of some wonderful conservative idea that it is "dividing us". Which is precisely the point: many conservative ideas represent a return to the good old, tried and true things that have worked well in the past.
Alan Caruba wrote:
- It hardly needs to be said that today’s liberals and conservatives loath one another, nor that the nation is as sharply divided politically as in the days before the Civil War. Politically, America has swung back and forth between liberal and conservative administrations as evidenced by the elections of the previous century and this new one. 
- The Curse of Liberalism - Alan Caruba - September 9, 2013