“The Declaration of the Rights of Man and the Citizen” tells us that?

The basic principle of the Declaration was that all “men are born and remain free and equal in rights” (Article 1), which were specified as the rights of liberty, private property, the inviolability of the person, and resistance to oppression (Article 2).

Explanation:

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

oil! is what i am assuming