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Franz Ferdinand held significant influence over the military, and in 1913 he was appointed inspector general of the Austro-Hungarian armed forces. Archduke Francis Ferdinand was the heir presumptive to the throne of Austria-Hungary. His assassination in Sarajevo is considered the most immediate cause of World War I.

Austria-Hungary presented Serbia with a rigid ultimatum on July 23, 1914, demanding, among other things, that all anti-Austrian propaganda within Serbia be suppressed, and that Austria-Hungary be allowed to conduct its own investigation into the archduke’s killing. Though Serbia effectively accepted all of Austria’s demands except for one, the Austrian government broke diplomatic relations with the other country on July 25 and went ahead with military preparedness measures.

The Battle of Tannenberg was fought between Russia and Germany between 26 and 30 August 1914, the first month of World War I. The battle resulted in the almost complete destruction of the Russian Second Army and the suicide of its commanding general, Alexander Samsonov. A series of follow-up battles destroyed most of the First Army as well and kept the Russians off balance until the spring of 1915

It resulted in an Allied victory against the German armies in the west. The battle was the culmination of the German advance into France and pursuit of the Allied armies which followed the Battle of the Frontiers in August and had reached the eastern outskirts of Paris. A counter-attack by six French armies and the British Expeditionary Force along the Marne River forced the Imperial German Army to retreat northwest, leading to the First Battle of the Aisne and the Race to the Sea. The battle was a victory for the Allied Powers but led to four years of trench warfare stalemate on the Western Front.

The battle was the longest of the First World War and took place on the hills north of Verdun-sur-Meuse. The battle lasted for 302 days, the longest and one of the most costly in human history. In 2000, Hannes Heer and Klaus Naumann calculated that the French suffered 377,231 casualties and the Germans 337,000, a total of 714,231, an average of 70,000 a month. In 2014, William Philpott wrote of 976,000 casualties in 1916 and 1,250,000 in the vicinity during the war.

The battle was intended to hasten a victory for the Allies and was the largest battle of the war's Western Front. More than three million men fought in the battle and one million men were wounded or killed, making it one of the bloodiest battles in human history. At the end of the battle, British and French forces had penetrated 10 km into German-occupied territory. This was their largest territorial gain since the Battle of the Marne in 1914

The Treaty of Brest-Litovsk (also known as the Brest Peace in Russia) was a peace treaty signed on March 3, 1918, between the new Bolshevik government of Russia and the Central Powers (German Empire, Austria-Hungary, Bulgaria, and the Ottoman Empire), that ended Russia's participation in World War I. The treaty was annulled by the Armistice of 11 November 1918, when Germany surrendered to the western Allies. However, in the meantime it did provide some relief to the Bolsheviks, already fighting the Russian Civil War

The last time Congress passed joint resolutions saying that a "state of war" existed was on June 5, 1942, when the U.S. declared war on Bulgaria, Hungary, and Romania.[44] Since then, the US has used the term "authorization to use military force," as in the case against Iraq in 2003.

The German troops were fatigued and the US still had 140,000 “fresh” troops. The 2nd battle of the Marne was on play and the central powers crumbled. The Ottoman Empire surrenders.

After the Germany agreed to cease fire in the 11th hour of the 11th day of the 11th moth in 1918, The Paris Peace Conference, also known as the Versailles Peace Conference, was the meeting in 1919 and 1920 of the victorious Allies after the end of World War I to set the peace terms for the defeated Central Powers. The conference began on 18 January 1919. With respect to its end, Professor Michael Neiberg noted, "Although the senior statesmen stopped working personally on the conference in June 1919, the formal peace process did not really end until July 1923, when the Treaty of Lausanne was signed."