Answer: The Russian Revolution took place in 1917, during the final phase of World War I. It removed Russia from the war and brought about the transformation of the Russian Empire into the Union of Soviet Socialist Republics (USSR), replacing Russia's traditional monarchy with the world's first Communist state.
Explanation:
It reduced their overall size and increased their PTSD, then called 'battle fatigue. The reduced population stimulated the "Baby boom".
Hunter-gathering tribes
small towns and nomadic groups
city-states and small kingdoms
empires
nation-states
