In June 1914 the world was ruled by
great empires, and the ideals of
nationalism and
democracy ran wild on the streets of
Europe and
Russia. But these ideals were strongest in Serbia's desire to create a united south-Slav state. In our timeline these ideals reached a boiling point and finally one of the greatest wars of all time broke out. The war was fought by the
Triple Alliance (Central Powers) and the
Triple Entente (Allied Powers) between 1914 and 1918. With the war ending in 1918 resulting in the defeat of the Central Powers and the Treaty of Versailles being enforced on the losers. Resulting in bitterness and hatred and 20 years later a second world war that was far more terrible than the first.
The main shift in the timeline I have found to be in the
Battle of Jutland in 1916. In this battle
Reinhard Scheer succeeded in destroying more British ships giving the
German Navy a huge morale boost. This resulted in the
August 19 action being more bold and successfully breaking the British Blockade. Resulting in a decrease in
unrestricted submarine warfare and keeping the
United States neutral. Without American support in Europe and the
collapse of the Russian Empire, Allied morale suffered a fatal blow. The
Central Powers managed to beat the Allied armies in the
west with the
Spring Offensive. One by one the Allies signed an
armistice with the Central Powers, the war ending on 13 August 1918.