Final answer:
In 1789, the National Assembly of France was a significant revolutionary body formed after being locked out of their initial meeting place, leading to the historic Tennis Court Oath and the beginning of the French Revolution. This precipitated widespread political and social upheaval, including the storming of the Bastille and ultimately changing the French political system from an absolute monarchy to a constitutional monarchy.
Step-by-step explanation:
Locked out of their building in 1789, the National Assembly of France was forced to meet on a tennis court after King Louis XVI closed the Estates Hall. On June 17, 1789, the Third Estate, joined by some from the First and Second Estates, had declared themselves the National Assembly--intending to act in the interests of the people rather than retain the estates system which unfairly privileged the nobility and clergy.
This assembly was pivotal in initiating the French Revolution, which saw significant and violent upheavals, such as the taking of the Bastille and the eventual march on Versailles by the Parisian women, leading to far-reaching social and political change. They would not disband until a constitution was established, leading to the swearing of the Tennis Court Oath, the declaration of tax collection as void, and actions to address food shortages.
On June 20, 1789, the National Assembly gathered at an indoor tennis court, where they vowed through the Tennis Court Oath not to dissolve until France had a written constitution. This marked a direct challenge to the authority of King Louis XVI and the ancien régime. In response to the formation of the new assembly, Louis XVI gathered troops, sparking the creation of the public national guard and later, the storming of the Bastille on July 14, 1789, a seminal event of the French Revolution.