The answer is World War I.
World War I started in 1914. This war caused citizens to revolt and overthrow corrupt governments in areas like Russia, where the Bolshevik Revolution took place during 1917.
World War I ended with the Treaty of Versailles in 1919. This punished Germany for the beginning of World War I. Along with Germany, several other countries were destroyed. Not only was their infrastructure destroyed, their economy was suffering as well. This all helps lead to the rise of fascism.
I think it should be considered a massacre because it was a mass killing
Answer:
They can't work/function on their own and they're short
Explanation:
It allowed them to make their own laws separately from Britian.
