Reddit mentions of Inventing the People: The Rise of Popular Sovereignty in England and America

> The Republic lays the basis for the entirety of the Western systems of government, systems of government that has catapulted the West into becoming the most powerful modern civilizations in the world.

I'm not sure that it does everything you suppose it to do. Have you read Republic recently? The system it actually recommends doesn't much resemble any modern (or, for that matter, ancient) government. It is, for one thing, heavily stratified, with a monarch trained from birth to match the ideal of the philosopher-king. The next social caste is that of the Guardians, and the lowest class is that of the Artisans. Poets are altogether expelled from the polis.

In terms of influence on modern Western democracy, the Athenian Constitution (attributed to Aristotle) is probably more crucial; the Codex Theodosianus had a more direct influence on the evolution of Western legal and political norms than either, and was probably not eclipsed in importance until the Renaissance or later.

Even the Bible had a greater political influence than you give it credit for, since the establishment of Christianity ultimately required new conceptions about the nature of governance. The notion that ultimately took hold was that disorder was a result of Original Sin, and governance a kind of necessary evil vouchsafed by God to counteract disharmony. The role of the ruler was to ensure harmony, and sovereignty depended on the ruler's conformity to the natural order established by God. In other words, the people were bound to follow a ruler only so long as the ruler didn't overstep their religious limits. That later became the basis for the concepts of natural law and, as Edmund Morgan has shown, evolved in the British system into the modern notion of popular sovereignty.