"The War to End All Wars"

"The War to End All Wars" refers to World War I, a devastating conflict from 1914 to 1918. It was called this because many believed it would be the final major war, ending warfare through new military technology and diplomatic efforts. The war involved many nations and resulted in immense loss of life, destruction, and political upheaval. Despite this hope, it ultimately set the stage for future conflicts, including World War II. The phrase captures the intense desire at the time to prevent such widespread violence from happening again.