Final answer:
The National Assembly was established by representatives of the Third Estate in response to the unfair voting system within the Estates General, marking a significant shift towards representative democracy during the French Revolution.
Step-by-step explanation:
The French Congress established by representatives of the Third Estate on June 17, 1789, referring to the pivotal point in the early stages of the French Revolution, was known as the National Assembly. This body signified a critical departure from the traditional French political system and a move towards representative democracy. It became the embodiment of the general population's assertiveness in opposition to the existing estates system, which unfairly distributed power among the clergy, nobility, and commoners. The National Assembly's creation was a direct consequence of the Third Estate's disenchantment with the existing Estates General, in which each estate, despite their disproportionate sizes, had one vote, effectively stymieing any substantive changes that could favor the majority. Their independence was declared during a dramatic meeting where they took the famous Tennis Court Oath, vowing not to disband until a constitution was established.