Revolution

Political revolutions usually occur when an outspoken leader provides a focal point for the discontented citizens to vent their grievances. 

Revolutions also occur when tensions between opposing parties reach a boiling point. These intense emotions are unleashed through a catalyst, a major event that permits the outflow of emotion and actions towards the achievement of a certain cause. Incidents such as the assassination of political leaders, violence in protest rallies and terrorist acts are examples of such catalysts.

Whether successful or not, revolt always brings about decisive change in government, thus fulfilling the chief characteristic of the said revolution. However, if the change is not satisfactory, chances are events will repeat themselves and cycle towards a new revolution.

In conclusion, revolution comes as a tool for the masses. An ineffective governing body will assuredly come under intense scrutiny. If the will of the people is not followed, then a government, no matter how strong, will fall under its own corruption.

... from  librarythinkquest.org