The reign of terror resulted in

The Reign of Terror instituted the conscripted army, which saved France from invasion by other countries and in that sense preserved the Revolution.

The Reign of Terror, commonly The Terror (French: la Terreur), was a period of the French Revolution when, following the creation of the First French Republic, a series of massacres and numerous public executions took place in response to revolutionary fervour, anticlerical sentiment, and spurious accusations of treason by Maximilien Robespierre and the Committee of Public Safety.

To have a bunch of countries to team up, and communicate not let the communist break them apart and take over the world