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Easy, think about it - without World War 1, World War 2 would never have happened...! Therefore, WW1's contribution to history was WW2...!
World War 1, World War 2, Indian Independence, Green Revolution, Bhangra,
543 American service women died in World War 2 .
American Revolution, Mexican war, Civil war, Spanish-American war, World War 1, World War 2, Korean war.
Canada's contribution to World War 2 was more logistical than their contribution to World War 1. They supplied food, ammunition and other necessities to the soldiers. In World war 1, they contributed by fighting along the Western Front with the help of the French and British troops. They fought against the Germans along the Western Front.
I believe World War 2.
American Civil War
Flying with crews of B17s and living to tell it.
They wanted to beat Germany in World War 2.
They learnt a number of things, such as women contribution to war, technology, war tanks, aeroplanes, weapons, potlitics, ways to make money...
World War 2