Final answer:
The cause of the Committee of Public Safety overseeing the Reign of Terror was to maintain control and suppress threats during the French Revolution.
The Reign of Terror was unleashed to eliminate counterrevolutionaries and political opponents, resulting in the execution of thousands of people. The period ended when Robespierre was accused of treason and executed.
Step-by-step explanation:
The cause of the Committee of Public Safety overseeing the Reign of Terror was to maintain control and suppress internal and external threats during the French Revolution.
The Committee of Public Safety, led by Maximilien Robespierre, unleashed the Reign of Terror as a means to eliminate counterrevolutionaries, émigrés, aristocrats, and political opponents. This period, from 1793 to 1794, resulted in the execution of approximately 50,000 people.
The Reign of Terror ended when the National Convention turned against Robespierre and accused him of treason. Robespierre and his followers were executed by the guillotine.