Why did the third estate leave the estates general?

The Third Estate left the Estates-General in 1789 primarily due to their frustration with the voting system, which favored the First and Second Estates despite the Third Estate representing the majority of the population. They sought greater representation and reforms, but their demands were largely ignored. This led them to declare themselves the National Assembly, asserting their intention to draft a new constitution for France, thus marking a pivotal moment in the French Revolution.