The dates aren’t settled.
Many mark the start as Germany’s invasion of Poland and the end as V-J Day or Japan’s formal surrender. But historians still dispute both the opening and the closing bookends.World War II: The War Without a Single Start or End Date
How could it start earlier?
Some point to Japan’s invasion of Manchuria, the Italian invasion of Abyssinia, the Spanish Civil War, or even the Battles of Khalkhin Gol.World War II: The War Without a Single Start or End Date
