Answer:
Many people assume that the war resulted directly from the alliance structure that bound all the European great powers together before 1914. Germany was allied to Austria-Hungary and Italy; Russia was allied to France, and both countries had an entente (a diplomatic agreement) with Britain.
The alliances certainly contributed to the prewar build-up of tension between the great powers but, perhaps surprisingly, none of these alliances actually produced a declaration of war.
In July 1914 Germany gave Austria-Hungary a sweeping guarantee of support known as the ‘Blank Cheque’, which went far beyond the terms of their formal alliance. The French came in because Germany launched a pre-emptive strike against them; Britain declared war not because of the entente agreements but because the Germans invaded Belgium, and Italy first kept out of the war and then came in against its own allies!
Explanation:
