The French Revolution began as a result of the social and political inequalities in France at the time.
The French government was also bankrupt, which was a direct result of the profligate spending of Louis XIV, whose outrageous expenditure had never been carefully addressed by subsequent monarchs. This lack of money made it difficult for the monarchy to effectively crack down on the organised dissent as effectively as it would have liked.
The influence of Enlightenment thinkers like Voltaire and Rousseau and the favourable outcome of the earlier American Revolution some twenty years earlier also acted as an inspiration for the Third Estate in the Estates General to question their lack of power and influence in society.
The attached sit may be of some interest.
http://chnm.gmu.edu/revolution/browse/images/#