In the build-up to the violent outbreak of the French Revolution, a meeting of the three-part Estates-General was in fact called by Louis XVI (rather than Louis XIV) in order to gain support for needed economic reforms. Meeting in May of 1789, the Estates-General soon took the initiative for reforms far beyond those envisioned by the French king.
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By calling the Estates-General Louis the XIV would be at a disadvantage because it would give more power to the 1st Estate and the 2nd Estate. He would be losing power and he had no reason to call on the Estates-General. Louis the XVIII had to call on the Estates-General because the country was about to go bankrupt and he had no other choice but to call on the Estates-General and ask them for a loan.
The Estates General had existed for centuries, while the National Assembly was formed in 1789. - Apex
The meetong of the Estates General was called by King Louis XVI because of the huge French National debt.
He needed help to resolve the French financial crisis.
In 1789, the meeting of the French 'Estates-General' contributed to France's financial crisis, not to overlook its more general socio-political crisis, by adding additional demands and placing additional pressures on the French monarchy -- again, financially and otherwise. Once Louis XVI regretted his calling of the Estates-General meeting to such an extent that he attempted to disband it, however, it was too late: the French Revolution had begun.