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When Germany invaded Poland in 1939, France and Britain, who had promised aid to Poland if Germany invaded, entered the war on the Allied side, thus starting the Second World War.

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What German action finally caused Britain and France to begin World War II?

The invasion of Poland on the 1st September 1939


What did France and Britain DO in World War 2?

invasion of Poland


Why do still the experts not knows the war2 trigger?

The experts do know one of the triggers that caused World War 2. It was because of Germany's invasion of Poland that caused France and Britain to declare war.


What caused Britain to fight in world war 1?

Britain entered the fighting World War I after the German invasion of Belgium.


Great Britain and France entered World War 2 because of the invasion of where?

Poland


Which country had a treaty with Poland that caused them to join World War 2?

France and Great Britain (and most of the commonwealth countries) declared war on Germany as a result of their invasion of Poland.


What events caused Britain to fight World War 1?

Who assassinated the above leader in world war 1


What event caused britain to fight in world war 1?

The German army crossing into Belgium, whose neutrality had been guaranteed by Britain.


What caused the conflict of World War 2?

Here is the main summary of why World War 2 happened from an article. World War Two began in September 1939 when Britain and France declared war on Germany following Germany's invasion of Poland. Although the outbreak of war was triggered by Germany's invasion of Poland, the causes of the war are more complex.


What led France and Britain to declare war against Germany to begin World War 2?

During the 1930's, Britain and France had a defence agreement with Poland. On 1 September 1939, German troops invaded Poland, so on 3 September 1939, in response to that invasion, Britain and France declared war on Germany.


When did great Britain and France declare war on Germany and why?

Great Britain and France declared war on Germany on September 3, 1939, in response to Germany's invasion of Poland on September 1, 1939. This invasion violated agreements made by Germany to respect Polish sovereignty, and both Britain and France had pledged to support Poland in the event of an attack. The declaration marked the beginning of World War II in Europe.


What event caused world war 2 to break out in Europe?

World War II officially began after Germany invaded Poland. The invasion of Poland caused England and France to declare war on Germany.