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In the 1930's, Britain and France had a defence agreement with Poland. On 1 September 1939, German forces attacked Poland, so on 3 September 1939 Britain and France declared war on Germany.

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Q: What event caused world war 2 in September 1939?
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Which event caused the outbreak of world war 2 in September 1939?

the german invasion of Poland


What event led to the start of World War 2?

On September 1st 1939 the German army invaded neighboring Poland and caused what is known as today World War II.


When did the event occur which started world war 2?

the invasion of poland 1st september 1939


Which event sparked World War 2?

The German invasion of Poland on 1st September 1939


What event happened first during World War ll?

The Nazi invasion of Poland on September 1st, 1939 was the first event of World War 2.


What caused World War 2 When did it start?

The German attack on Poland 1 September 1939


What event directly led to the start of World War 2?

The German invasion of Poland on 1st September 1939.


What event is the start of World War 2?

Most historians agree that the German invasion of Poland on September 1, 1939, was the event that marked the start of World War 2.


Which event officially started World war two in Europe?

the event was when Germany invaded Poland. when Britain and France found out they declare war on Germany.


How did world war two begin?

Germany invaded Poland on September 1, 1939, and caused panic in Europe.


Which major event took place on September 1 1939 and initiated World War 1?

Germany invaded Poland


Which event is most closely associated with start of world war in Europe?

The German invasion of Poland on 1 September 1939