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Great Britain entered World War 1 on the 4th August 1914, by the 12th August 1914 France and Britain had declared War on Austro-Hungary.
Britain entered World War I because Germany invaded Belgium to get into France easier. Britain basically said "Belgium is our ally, and if you invade them we will declare war on you".

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βˆ™ 12y ago
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βˆ™ 10y ago

The major powers of Europe, including Great Britain declared war on July 21, 1914. The war lasted over four years, ending on November 11, 1918.

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βˆ™ 16y ago

Im almost completely positive it was April 6, 1917. Wilson asked Congress to declare war 4 days earlier on April 2, 1917.

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βˆ™ 11y ago

WWI started on July 28th, 1914
WW1 started on the 28th of July 1914 and lasted until 11 November 1918.

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βˆ™ 13y ago

April 1917. I know because I am studying history and it was in the text book :)

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βˆ™ 17y ago

1914 right at the start.

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βˆ™ 15y ago

August 4th, 1914

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βˆ™ 12y ago

1914

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Q: On what date was the start of world war 1?
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