[Answer] Which war was the "War to End All Wars?"

Step 1 : Introduction to the question "Which war was the "War to End All Wars?""

...When World War I was over, the leaders of the world's nations wanted to prevent such a destructive conflict from repeating. The massive slaughter of military and civilian populations on all sides prompted prolonged peace negotiations in its aftermath. The final proclamation, the Treaty of Versailles of 1919, unfortunately, was so harsh in its terms that it would set the stage for World War II. Rather than the "War to End All Wars," as it was commonly called, WWI was the prelude to the rise of the Nazi Party in the 1930s. Source: Reference.com

Step 2 : Answer to the question "Which war was the "War to End All Wars?""

World War I:

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