when did the second world war start

The Second World War is generally considered to have started on 1 September 1939, when Nazi Germany invaded Poland.

Quick answer in context

• In Europe , World War II began on 1 September 1939, with Germany’s attack on Poland.

• Britain and France then declared war on Germany on 3 September 1939, turning it into a wider European conflict.

• Some historians point to earlier conflicts in Asia (like the Second Sino‑Japanese War in 1937) as the start of the wider global war, but the most standard date for “when did the Second World War start” is 1 September 1939.

In most history books and school curricula, if you see the question “When did the Second World War start?”, the expected answer is: 1 September 1939 (German invasion of Poland).

TL;DR: When someone asks “when did the second world war start,” the commonly accepted date is 1 September 1939.

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