He was assassinated in the Bosnian city of Sarajevo. The cascade of events that followed plunged Europe and the world into the Great War, later known as World War 1.So he was generally the reason World War 1 started.

He indirectly touched off World War I by assassinating Archduke Francis Ferdinand. He was a nineteen-year-old student and Bosnian Serb nationalist.

Lenin did not support World War 1.He believed a defeat for Russia would help bring about the revolution he wanted. He was the founder of the Russian Communist Party and the moving force behind the Russian Revolution of 1917.

At the beginning Kaiser Wilhelm II's role in the war was of limited importance. Although he insisted on being consulted, Wilhelm left most decisions to his generals.Wilhelm II embarked on the construction of a German navy.Wilhelm II demanded that the mobilization be retracted; when it was not, he declared war on Russia.

He was the last Russian emperor of his time.He tried to focus his attention towards the Balkans in WW1.One fun fact about him is in 1890-1891 he went on a round-the-word trip where he got a tattoo and was nearly killed.

He led France through the critical days of World War I and headed the French delegation to the Paris Peace Conference.In 1902 Clemenceau was elected senator for the Var, and he accepted the post of minister of interior in the Sarrien ministry in 1906.

During the war the King had no direct responsibility. But his duties, nonetheless, were manifold. He made 450 recorded inspections of military and naval installations and 300 visits to hospitals, as well as personally distributing 58,000 decorations.He was king of Great Britain and Northern Ireland and emperor of India from 1910 to 1936.

He was known during his lifetime for his historical and political novels.He served briefly in the U.S. Navy, working as an editor for the Army and Navy Journal, and then joined the staff of Cosmopolitan Magazine.

Woodrow Wilson, the president of the United States, led the Congress to enact progressive reform legislation, led the U.S. through World War I. He also led the Paris Peace Conference of 1919 to make the League of Nations part of the peace treaty with Germany.

He was commander in chief of the American Expeditionary Force in Europe during World War I. Pershing single-mindedly pursued his idea of an independent American army and in this process gained the support of the War Department and President Wilson, overcoming efforts by Allied leaders to force various forms of amalgamation.

He was commander in chief of the Allied armies in World War I. At the beginning of World War I, Foch was in charge of the XX Army Corps and fought in Lorraine.

He commanded British forces on the Western front in Europe during World War I. He is credited with the final British victories over the German armies in 1918.