What was a major cause of the french revolution? inequalities in the tax structure economic success of mercantilism failure of the congress of vienna continental system in europe?

I would try inequalities in the tax structure.  
The rich were paying less but getting more out the system.  
Poor could not even buy food.  
(Let them eat cake.)   

Protecting and assisting  u.s. citizens  living or traveling abroad; assisting u.s.  businesses  in the international marketplace; coordinating and providing support for international activities of other u.s. agencies (local, state, or federal government), official visits overseas and at home, and other diplomatic efforts.keeping the public informed about u.s. foreign policy and relations with other countries and providing feedback from the public to administration officials.providing  automobile registration  for non-diplomatic staff vehicles and the vehicles of diplomats of foreign countries having  diplomatic immunity  in the united states