Russian Civil War

What happened

After Bolshevik Revolution (Oct 1917), Russian Civil War erupted between Reds (Bolsheviks), Whites (Tsarist, liberal, and anarchist forces), and foreign interventionists (14 nations invaded, including US, UK, France, Japan). War lasted until 1922, fought across vast territories with primitive logistics. Reds' centralized command and interior lines prevailed over divided White opposition. Millions died through combat, famine, disease (Spanish Flu pandemic was lethal), and Bolshevik terror. The war cost perhaps 5-9 million lives—more than Russia's WWI losses. The conflict fundamentally shaped Soviet ideology (justified terror, permanent militarization).

Why it mattered

Bolshevik victory created the Soviet Union and initiated communist-capitalist Cold War (though delayed by WWII alliance). The civil war's brutality and foreign intervention convinced Soviets that the West was existentially hostile—a grievance that shaped 20th-century geopolitics. War Communism's forced requisitions and requisitions set precedent for Stalinist collectivization's brutality. The victory demonstrated that a revolutionary party with military discipline could defeat ideologically fragmented opponents. Soviet triumph eventually led to WWII alliance with West and subsequent Cold War.