The French Revolution began in 1789 due to political and economic grievances with the monarchy. The Third Estate, which made up 97% of the population but had no political power, demanded equal representation. When King Louis XVI refused, the Bastille prison was stormed on July 14th, 1789, marking the start of the Revolution. The National Assembly abolished the special privileges of the nobility and clergy and created a constitutional monarchy, declaring equal rights and liberties for all citizens. However, foreign threats and the execution of Louis XVI and Marie Antoinette led to the Reign of Terror, with thousands executed by guillotine under Robespierre's Jacobin leadership before it ended.