what event led to the 3rd estate forming the national assembly
National Assembly (French Revolution) The Estates-General had been called on May 4, 1789 to deal with France's financial crisis, but promptly fell to squabbling over its own structure. Its members had been elected to represent the estates of the realm: the 1st Estate (the clergy), the 2nd Estate (the nobility) and the 3rd Estate (which, in theory, represented all of the commoners and, in practice, represented the bourgeoisie). The Third Estate had been granted "double representation"—that is, twice as many delegates as each of the other estates—but at the opening session on May 5, 1789 they were informed that all voting would be "by power" not "by head", so their double representation was to be meaningless in terms of power. They refused this and proceeded to meet separately.[1][2]
National Convention The National Convention (French: Convention nationale) was the third government of the French Revolution, following the two-year National Constituent Assembly and the one-year Legislative Assembly. Created after the great insurrection of 10 August 1792, it was the first French government organized as a republic, abandoning the monarchy altogether. The Convention sat as a single-chamber assembly from 20 September 1792 to 26 October 1795 (4 Brumaire IV under the Convention's adopted calendar).