Why did the Third Estate start to talk about overthrowing Louis XVI?

To put it simply, the third estate revolted in response to an unfair economic and political system that disproportionately taxed the middle classes and peasants while benefiting the other estates

Explanation:

the three-fifths compromise was proposed by james wilson and roger sherman, who were both delegates for the constitutional convention of 1787. however, the three-fifth compromise has its roots further back in history, dating back to the continental congress in 1783. the compromise was a result of the apportionment of taxes being related to land values.

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