Complete change from one constitution to another
Modification of an existing constitution
Putting an end to the dictatorial rule of their kings and establishing a socio-political system based on equality and democracy was the main purpose of French revolution.There are many reasons behind French Revolution . Some are
1)Influence of the French thinkers : Famous philosophers and intellectuals Montesque , Rousseau , Voltaire encouraged the rebels by their revolutionary writings
2)Effects of American war of Independence :The American war of Independence  influenced the French tremendously . Many of he French who fought against the British in America returned  to  their motherland . They encouraged  the rebels by  giving them all support and played a pivotal role in the revolution

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