There are a number of differences between World War I and II.
The primary is the origin story.
With World War I, the war broke out because of a complex web of diplomatic and military alliances that were summoned after the assassination of the Arch Duke of the Austro Hungarian Empire. It was further exacerbated by a culture of nationalism throughout Europe.
World War II broke out because of the belligerence of the German Third Reich and its allies.
Answer: The First World War (WWI) was fought from 1914 to 1918 and the Second World War (or WWII) was fought from 1939 to 1945. They were the largest military conflicts in human history. ... World War II was especially heinous because of the genocide of Jewish people perpetrated by the Nazis.
