Men have no other means of maintaining themselves but to form by aggregation a sum of forces that could gain the upper hand over the resistance of obstacles, so that their forces are directed by means of a single moving power and made to act in concert.
Gist of Idea
To overcome obstacles, people must unite their forces into a single unified power
Jean-Jacques Rousseau (The Social Contract (tr Cress) , I.6)
I prefer the Aristotelian view, that men are naturally gregarious and social (like bees and ants), so this act of solidarity in superfluous. A human people is only broken up by violence or disaster, like kicking over an ants' nest.
Rousseau,Jean-Jacques: 'The Basic Political Writings', ed/tr. Cress,Donald A. [Hackett 1987], p.147
Idea 19793 We need a protective association which unites forces, but retains individual freedom [Rousseau]