Why did the third estate form the national assembly?

The third Estate formed the National Assembly because otherwise the first and second estates (nobles and the clergy) would charge the tax burden on them.

Explanation:

In the late 1700´s France was going through a financial crisis due to the excesive spending and lack of economic planning of Louis XVI and Marie Antoinette. Louis XVI called the Estates-General. There were three estates. The first estate were the nobles, the second estate was the clergy of the catholic church and the third estate were the commoners or common people. The nobles and the clergy had common interests and wanted to charge the tax burden to the commoners, or third estate. The third estate decided to form the National Assembly with the objective of avoiding this and also to create and provide equal rights and to limit the kings power.

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