The French Revolution (1789-1799) was one of the most transformative events in modern history, and its main cause was the combination of economic hardship and social inequality that pervaded French society under the Ancien Regime.
Pre-revolutionary France was divided into three estates: the First Estate (clergy), the Second Estate (nobility), and the Third Estate (commoners, including peasants, workers, and the bourgeoisie). The First and Second Estates enjoyed enormous privileges, including exemption from most taxes, while the Third Estate bore the heaviest tax burden despite comprising over 95% of the population. Widespread poverty, food shortages (especially after poor harvests in the late 1780s), rising bread prices, and resentment at the lavish spending of the royal court at Versailles created explosive conditions.
These economic grievances were compounded by Enlightenment ideas about equality, natural rights, and popular sovereignty, which undermined the legitimacy of absolute monarchy and aristocratic privilege. The combination of material suffering and ideological awakening drove the revolution.
The collapse of the monarchy was a result of the revolution, not its cause - the monarchy fell because of the revolution. Foreign debt was a contributing factor (France's support for the American Revolution had worsened government finances), but it was the broader economic hardship and social inequality that mobilised the population. Foreign invasion occurred after the revolution began, not before it.
The correct answer is economic hardship and social inequality, the fundamental drivers that ignited the French Revolution.