In 1939, the United Kingdom and France went to war with Germany as a direct result of Germany's invasion of Poland.
This is further explained below.
<h3>What caused Great Britain and France to declare war on Germany in 1939?</h3>
In general, the decision to go to war with France was reached by the British government on May 20, 1756, marking the day the decision was made.
The French government did not formally declare war on Britain until the month of June when they did so in the form of an official declaration. On the other hand, the condition of events in Europe, in addition to the expanding military strength of Prussia, was the source of the greatest concern for the French.
As a result of Germany's invasion of Poland, the United Kingdom and France entered into a state of war with Germany in 1939. This was a direct consequence of Germany's actions.
Read more about the invasion of Poland
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