The two latter sources failed as nations became more free.

But in Attica it was not till the time of Solon, several centuries after the institution of slavery at Athens, that the right of the creditor to the personal services of the debtor was formally abolished.
A view of the moral effects of slavery--of the condition of the slaves at Athens--of the advantages of the system and its evils--of the light in which it was regarded by the ancients themselves, other and more fitting opportunities will present to us.
XXVI.

The introduction of an hereditary aristocracy into a particular country, as yet uncivilized, is often simultaneous with that of slavery.

A tribe of warriors possess and subdue a territory;--they share its soil with the chief in proportion to their connexion with his person, or their military services and repute--each becomes the lord of lands and slaves--each has privileges above the herd of the conquered population.

Suppose again, that the dominion is acquired by colonizers rather than conquerors; the colonizers, superior in civilization to the natives,--and regarded by the latter with reverence and awe, would become at once a privileged and noble order.
Hence, from either source, an aristocracy permanent and hereditary [67].