Britain's decision refers to the choice made by Great Britain to enter World War I on August 4th, 1914. This marked a significant turning point in the war as it brought one of the world's most powerful nations into the conflict.
Related terms
Triple Entente: An alliance formed between Great Britain, France, and Russia prior to World War I.
Archduke Franz Ferdinand: The heir to the Austro-Hungarian throne whose assassination sparked tensions leading up to WWI.
Neutrality: A policy adopted by some nations during times of conflict where they choose not to take sides or participate actively in war.