The base layer for the powder keg known as the French Revolution was the three estates.
One of the three estates was the king and lords who lived extravagantly, was unconnected from the people, their cries for reform were met with being locked out of the national assembly, and they heavily taxed them for food and money. The land owners or lords who paid an extremely small amount of taxes and didn't pay any attention to the people and took their land and took foodstuffs as well. Lastly was the Clergy who owned 10% of the land paid almost no taxes and as the others were they also were indifferent. All this and the fact that the almost unrepresented little people floated the taxes by at least 70% lead to unrest. But, beside that the people were also drafted into service and unable to use game on your lord's land or his machines without paying tribute if not you get imprisoned.