Answer: Wilhelm II.
Explanation:
Wilhelm II was a strong supporter of the military policy pursued in 1914-1918. After the assassination attempt on Archduke Franz Ferdinand in June 1914, he guaranteed Austria-Hungary every assistance from Germany in the fight against "Serbian barbarism". During a famous speech in the Reichstag in August 1914, Wilhelm II claimed: "From today I do not know political parties, I only know German citizens." The Kaiser's policy was unanimously supported by all the parliamentary factions of the Reichstag, including the SPD and the Center Party, which had been critical of the war up to that point.
During the war, most of which Wilhelm spent in the Supreme Headquarters of the German troops in Ples (Silesia), he gradually began to lose control of military operations, the actual decisions on all the most important operations were made by Generals Paul von Hindenburg and Erich Ludendorff. Since 1915, Wilhelm was actually removed from military command.
Nevertheless, he tried to produce the appearance of influence. On July 29, 1917, Wilhelm visited the theater of military operations near the town of Smorgon on his own train to express gratitude to the soldiers and officers who took part in defensive battles from July 19 to 26 at the positions of Smorgon-Krevo and repulsed the attack of Russian troops during the Kreva operation. The Kaiser's authority was greatly shaken in October-November 1918, when US President Woodrow Wilson declared that Wilhelm could not be a participant in peace negotiations. In the same year, Wilhelm had a Spanish flu.