Point of divergence
Worried by the growing discontent and disastrous military showing, tsar Nicholas II, on the 27 November 1915, signs a peace treaty with the Central Powers, in exchange for large territorial concessions. Discontent of the local population in the newly acquired territories wastes a lot of German resources and military capabilities, but, fighting on only one major front, Germany launches Paris offensive in late 1915, which is halted in a great upset victory by the French soldiers on the outskirts of Paris.
Worried by continued German success and the unrestricted submarine warfare, USA enters the war on the Entente side in early 1916. In the summer of 1916, Germany launches an offensive against British armies in Northern France, capturing Somme estuary and encircling the British army, which, however is able to successfully evacuate. In late 1916, Germany launches yet another successful attack, capturing Nancy and Verdun.
However, the growing number of Americans on the front lines (numbering one million at the onset of 1917) started to tip the balance in favour of Entente. After a hasty military organisation in 1916 - 1917, Russian Empire broke the peace treaty with the Central Powers and attacked the, largely undermanned, territory in the Eastern Front on 28 February 1918. German Empire finally agreed on an armistice on 11 October 1919.
Entente emerged victorious ...