Final answer:
The aftermath of Louis's Flight to Varennes had significant effects on the political landscape, fueling revolutionary sentiments and increasing tensions between France and other European monarchies. It also discredited the constitutional monarchy, leading to the more radical stage of the French Revolution.
Step-by-step explanation:
The aftermath of Louis's Flight to Varennes had significant effects on the political landscape of the time. Firstly, it shattered the illusion that the French monarchy was still firmly in control and exposed the vulnerability of the royal family. This event further fueled revolutionary sentiments and strengthened the position of the radical factions within the French Revolution.
Secondly, Louis XVI's failed attempt to escape increased tensions between France and other European monarchies. The neighboring countries, such as Austria, saw the flight as an attack on the system of monarchy and feared the spread of revolutionary ideals. This eventually led to several European nations declaring war on France and further destabilizing the political situation.
Lastly, the Flight to Varennes also discredited the constitutional monarchy that was established under the Constitution of 1791. The incident highlighted the deep divisions within the French society and made it clear that the moderates' attempts at compromise were futile. As a result, the revolution entered a more radical stage, leading to the execution of Louis XVI and Marie Antoinette and the rise of the Reign of Terror.