The ratio of the sovereign to the subject increases in proportion to the number of citizens. The larger the state becomes, the less liberty there is.
Gist of Idea
If the state enlarges, the creators of the general will become less individually powerful
Jean-Jacques Rousseau (The Social Contract (tr Cress) , III.01)
This is because we remain equally subjected to the state whatever its size, but have less power to influence if there are more citizens. In modern states we all feel pathetically powerless, because of the numbers.
Rousseau,Jean-Jacques: 'The Basic Political Writings', ed/tr. Cress,Donald A. [Hackett 1987], p.174