It's hard to describe. It has a "history starts here again" feeling. You can read Engels' Origin of the Family, State & Private Property, and the evolution of the modern state from Greece up until the modern era and it all seems a bit abstract. http://www.marxists.org/archive/marx/works/1884/origin-family/
But then we come back to Greece, and we've come full circle.
The further political history of Athens up to the time of Solon is only imperfectly known. The office of basileus fell into disuse; the positions at the head of the state were occupied by archons elected from the nobility. The power of the nobility continuously increased, until about the year 600 B.C. it became insupportable. And the principal means for suppressing the common liberty were – money and usury. The nobility had their chief seat in and around Athens, whose maritime trade, with occasional piracy still thrown in, enriched them and concentrated in their hands the wealth existing in the form of money. From here the growing money economy penetrated like corrosive acid into the old traditional life of the rural communities founded on natural economy. The gentile constitution is absolutely irreconcilable with money economy; the ruin of the Attic small farmers coincided with the loosening of the old gentile bonds which embraced and protected them. The debtor’s bond and the lien on property (for already the Athenians had invented the mortgage also) respected neither gens nor phratry, while the old gentile constitution, for its part, knew neither money nor advances of money nor debts in money. Hence the money rule of the aristocracy now in full flood of expansion also created a new customary law to secure the creditor against the debtor and to sanction the exploitation of the small peasant by the possessor of money. All the fields of Attica were thick with mortgage columns bearing inscriptions stating that the land on which they stood was mortgaged to such and such for so and so much. The fields not so marked had for the most part already been sold on account of unpaid mortgages or interest, and had passed into the ownership of the noble usurer; the peasant could count himself lucky if he was allowed to remain on the land as a tenant and live on one-sixth of the produce of his labor, while he paid five-sixths to his new master as rent. And that was not all. If the sale of the land did not cover the debt, or if the debt had been contracted without any security, the debtor, in order to meet his creditor's claims, had to sell his children into slavery abroad. Children sold by their father – such was the first fruit of father-right and monogamy! And if the blood-sucker was still not satisfied, he could sell the debtor himself as a slave. Thus the pleasant dawn of civilization began for the Athenian people.
http://www.marxists.org/archive/marx/works/1884/origin-family/ch05.htm
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