Robespierre and The Reign of Terror

The French Revolution promised democracy, but it did not happen immediately. First came "The Reign of Terror". Explain The Reign of Terror and Max Robespierre's involvement in it. Also, why did The Reign of Terror happen? And how were these executions carried out?
Links to help you.
Link to textbook.

The French Revolution: Social Causes

Explain some of the causes of The French Revolution. What were the three estates and why did the third estate feel used? How did the Enlightenment thinkers influence the French Revolution? What really triggered the revolution, what happened on July 14, 1789?
Use these links to help you.
Link to textbook.