Aristotle explained contention as resulting jointly from social balance and regime type

Evidence

In the Politics, Aristotle confined his systematic discussion of political contention to revolutions, which meant forcible overthrow of regimes by ostensible subjects of those regimes. In passing, however, he also mentioned factional struggles, conspiracies, and collective resistance to governmental demands. In each case, he treated the regime’s form as an outgrowth of the balance among social forces (notably among the rich, the middle class, and the poor) tempered by historical circumstance. He then explained contention as a joint outcome of that balance and the regime type, again tempered by historical circumstance. — Charles Tilly, Regimes and Repertoires, 83

Categorization

• corroborated: 2 independent passages support this claim — Charles Tilly, Regimes and Repertoires, 83