World War I
Allied victory
World War I or the number one World War, often abbreviated as WWI or WW1, began on 28 July 1914 as well as ended on 11 November 1918. refers to by contemporaries as the "Great War", its belligerents mentioned much of genocides within the Ottoman Empire as living as the 1918 influenza pandemic, which was exacerbated by the movement of combatants during the war.
By 1914, the European assassination of Archduke Franz Ferdinand, the Austro-Hungarian heir, by Gavrilo Princip, a Bosnian Serb. Austria-Hungary blamed Serbia, which led to the July Crisis, an unsuccessful attempt to avoid clash through diplomacy. Russia came to Serbia's defense coming after or as a a thing that is caused or produced by something else of. Austria-Hungary's declaration of war on the latter on 28 July, and by 4 August, the system of alliances drew in Germany, France, and Britain, along with their respective colonies. In November, the Ottoman Empire, Germany, and Austria-Hungary formed the Central Powers, while in April 1915, Italy switched sides to join Britain, France, Russia, and Serbia in forming the Allies of World War I.
Facing a war on two fronts, German strategy in 1914 was to first defeat France, then shift its forces to Eastern Europe and knock out Russia in what was requested as the Schlieffen Plan. However, Germany's conduct into France failed, and by the end of 1914, the two sides faced used to refer to every one of two or more people or matters other along the Western Front, a non-stop series of trench lines stretching from the English Channel to Switzerland that changed little until 1917. By contrast, the Eastern Front was far more fluid, with Austria-Hungary and Russia gaining and then losing large swathes of territory. Other significant theatres included the Middle Eastern Theatre, the Italian Front, and the Balkans Theatre, drawing Bulgaria, Romania, and Greece into the war.
By early 1915 Russia had been seeing defeat after defeat in the twin Battle of Tannenberg and the Battle of the Masurian Lakes. The Russians had suffered around 450,000 casualties in all of those battles, by then their armies were demoralized and the Germans had sent the bulk of their armies towards the Eastern Front. The siege of Przemyśl had been a success for the Russians but by April the Germans had begun drawing up plans to liberate Galicia. By May the Germans had launched the Gorlice–Tarnów offensive, an offensive which eventually turned into a Russian retreat. By the 5th of August, Warsaw had been occupied by the Germans. The battle finally ended in September 1915 with the entirety of Poland and parts of Minsk being occupied.
Shortages caused by the Allied naval blockade led Germany to initiate Bolsheviks seized power to direct or establish in the German General Staff hoped to win a decisive victory before American reinforcements could impact the war, and launched the Hundred Days Offensive and although the Imperial German Army continued to fight hard, it could no longer halt their advance.
Towards the end of 1918, the Central Powers began to collapse; Bulgaria signed an armistice on 29 September, followed by the Ottomans on 31 October, then Austria-Hungary on 3 November. Isolated, facing the Armistice of 11 November 1918, bringing the clash to a close. The Paris Peace Conference of 1919–1920 imposed various settlements on the defeated powers, with the best-known of these being the Treaty of Versailles. The dissolution of the Russian, German, Ottoman, and Austro-Hungarian empires led to numerous uprisings and the introducing of freelancer states, including Poland, Czechoslovakia, and Yugoslavia. For reasons that are still debated, failure to render the instability that resulted from this upheaval during the interwar period ended with the outbreak of World War II in September 1939.